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Allegheny County is a county in the southwest of the U.S. state of Pennsylvania. As of 2019 the population was 1,216,045, making it the state's second-most populous county, following Philadelphia County. The county seat is Pittsburgh. Allegheny County is included in the Pittsburgh, PA Metropolitan Statistical Area, and in the Pittsburgh Designated Market Area.

Allegheny was Pennsylvania's first county to bear a Native American name, being named after the Allegheny River. The word "Allegheny" is of Lenape origin, with uncertain meaning. It is usually said to mean "fine river", but sometimes said to refer to an ancient mythical tribe called "Allegewi" that lived along the river before being destroyed by the Lenape.

Little is known of the region's inhabitants prior to European contact. During the colonial era, various native groups claimed or settled in the area, resulting in a multi-ethnic mix that included Iroquois, Lenape, Shawnee, and Mingo. European fur traders such as Peter Chartier established trading posts in the region in the early eighteenth century.

1680 British map of western Pennsylvania and Allegheny County from the Darlington Collection
In 1749, Captain Pierre Joseph C?loron de Blainville claimed the Ohio Valley and all of western Pennsylvania for Louis XV of France. The captain traveled along the Ohio and Allegheny rivers inserting lead plates in the ground to mark the land for France.

Since most of the towns during that era were developed along waterways, both the French and the British desired control over the local rivers. Therefore, the British sent Major George Washington to expel the French from their posts, with no success. Failing in this objective, he nearly drowned in the ice-filled Allegheny River while returning. The English tried in 1754 to again enter the area. They sent 41 Virginians to build Fort Prince George. The French learned of the plan and sent an army to capture the fort, which they then resumed building with increased fortification, renaming it Fort Duquesne.

The loss cost the English dearly because Fort Duquesne became a focal point of the French and Indian War. The first attempt to retake the fort, the Braddock Expedition, failed miserably. It was recaptured in 1758 by British forces under General John Forbes; he had it destroyed after its capture. The British then built a new, larger fort on the site, including a moat, and named it Fort Pitt. The site is now Pittsburgh's Point State Park.

Both Pennsylvania and Virginia claimed the region that is now Allegheny County. Pennsylvania administered most of the region as part of its Westmoreland County. Virginia considered everything south of the Ohio River and east of the Allegheny River to be part of its Yohogania County and governed it from Fort Dunmore. In addition, parts of the county were located in the proposed British colony of Vandalia and the proposed U.S. state of Westsylvania. The overlapping boundaries, multiple governments, and confused deed claims soon proved unworkable. In 1780 Pennsylvania and Virginia agreed to extend the Mason–Dixon line westward, and the region became part of Pennsylvania. From 1781 until 1788, much of what had been claimed as part of Yohogania County, Virginia, was administered as a part of the newly created Washington County, Pennsylvania.

Allegheny County was officially created on September 24, 1788, from parts of Washington and Westmoreland counties. It was formed due to pressure from settlers living in the area around Pittsburgh, which became the county seat in 1791. The county originally extended north to the shores of Lake Erie; it was reduced to its current borders by 1800.

The Allegheny County Courthouse
In the 1790s, a whiskey excise tax was imposed by the United States federal government. This started the so-called Whiskey Rebellion when the farmers who depended on whiskey income refused to pay and drove off tax collector John Neville. After a series of demonstrations by farmers, President George Washington sent troops to stop the rebellion.

The area developed rapidly in the 1800s to become the nation's prime steel producer; Pittsburgh gained the label "Steel Capital of the World".

In 1913 the County's 125th anniversary was celebrated with a week long chain of events, the final day September 27 was marked with a steamboat parade consisting of 30 paddle wheelers which sailed from Monongahela Wharf down the Ohio to the Davis Island Dam. The boats in line were the Steel City (formerly the Pittsburgh and Cincinnati packet Virginia), the flag ship; City of Parkersburg, Charles Brown, Alice Brown, Exporter, Sam Brown, Boaz, Raymond Horner, Swan, Sunshine, I. C. Woodward, Cruiser, Volunteer, A. R. Budd, J. C. Risher, Clyde, Rival, Voyager, Jim Brown, Rover, Charlie Clarke, Robt. J. Jenkins, Slipper, Bertha, Midland Sam Barnum, Cadet, Twilight, and Troubadour.

Geography
According to the U.S. Census Bureau, the county has a total area of 745 square miles (1,930 km2), of which 730 square miles (1,900 km2) is land and 14 square miles (36 km2) (1.9%) is water.

Three majors traverse Allegheny County: the Allegheny River and the Monongahela River converge at Downtown Pittsburgh to form the Ohio River. The Youghiogheny River flows into the Monongahela River at McKeesport, 10 miles (16 km) southeast. There are several islands in these courses. The rivers drain into the Gulf of Mexico via the Mississippi River. Although the county's industrial growth caused the clearcutting of the area's forests, a significant woodland remains.

Adjacent counties
Butler County (north)
Armstrong County (northeast)
Beaver County (northwest)
Westmoreland County (east and south)
Washington County (southwest)
Major roads and highways
I-76 / Penna Turnpike
I-79
I-279
I-376
I?376 Bus.
I-579
US 19
US 22

US 22 Bus.
US 30
PA 8
PA 28
PA Turnpike 43
PA 48
PA 50
PA 51
PA 60
PA 65
PA 88
PA 121
PA 130
PA 136
PA 148
PA 286
PA 366
PA 380
PA Turnpike 576
PA 791
PA 837
PA 885
PA 906
PA 910
PA 978
PA 980
Climate
Allegheny has a humid continental climate which is hot-summer (Dfa) except in higher areas where it is warm-summer (Dfb).

Until January 1, 2000, Allegheny County's government was defined under Pennsylvania's Second Class County Code. The county government was charged with all local activities, including elections, prisons, airports, public health, and city planning. All public offices were headed by elected citizens. There were three elected county commissioners.

On January 1, 2000, the Home-Rule Charter went into effect. It replaced the three elected commissioners with an elected chief officer (the County Executive), a county council with 15 members (13 elected by district, two elected county-wide), and an appointed county manager. The changes were intended to maintain a separation of powers between the executive and legislative branches while providing greater citizen control.

County Medical Examiner office
The county has 130 self-governing municipalities, the most in the state. (Luzerne is second with 76). The county has one Second Class City (Pittsburgh) and three Third Class Cities (Clairton, Duquesne, and McKeesport).

A 2004 study found the county would be better served by consolidating the southeastern portion of the county (which includes many small communities with modest economies) into a large municipality ("Rivers City") with a combined population of approximately 250,000.

State relations
Under the Onorato administration, Allegheny County paid $10,000 per month to Robert Ewanco, of Greenlee Partners, to lobby the Pennsylvania General Assembly. County officials credit him with a "20-fold" return in the form of appropriations for a widening project on Pennsylvania Route 28, as well as a footbridge and security cameras at Duquesne University.

County Executive
Rich Fitzgerald, Democrat
County Council
Bethany Hallam, At-large, Democrat
Tom Baker, District 1, Republican
Cindy Kirk, District 2, Republican
Anita Prizio, District 3, Democrat
Patrick Catena, President, District 4, Democrat
Tom Duerr, District 5, Democrat
John F. Palmiere, District 6, Democrat
Nicholas Futules, District 7, Democrat
Paul Zavarella, District 8, Democrat
Robert J. Macey, Vice President, District 9, Democrat
DeWitt Walton, District 10, Democrat
Paul Klein, District 11, Democrat
Robert Palmosina, District 12, Democrat
Olivia Bennett, District 13, Democrat
Samuel DeMarco, III, At-large, Republican
Other elected county offices
Controller, Chelsa Wagner, Democrat
District Attorney, Stephen A. Zappala Jr., Democrat
Sheriff, William P. Mullen, Democrat
Treasurer, John K. Weinstein, Democrat
Politics
Presidential election results
Voter registration
As of November 7, 2017, there were 921,861 registered voters in the county; a majority were Democrats. There were 536,248 registered Democrats, 258,340 registered Republicans, 120,994 voters registered to other parties, 4,929 to the Libertarian Party and 1,350 voters registered to the Green Party.

The Republican Party had been historically dominant in county-level politics in the 19th and early 20th centuries; prior to the Great Depression, Pittsburgh and Allegheny County had been majority Republican. Since the Great Depression on the state and national levels, the Democratic Party has been dominant in county-level politics and is the Democratic stronghold of western Pennsylvania. In 2000, Democrat Al Gore won 56% of the vote and Republican George W. Bush won 41%. In 2004, Democrat John Kerry received 57% of the vote and Republican Bush received 42%. In 2006, Democrats Governor Ed Rendell and Senator Bob Casey, Jr. won 59% and 65% of the vote in Allegheny County, respectively. In 2008, Democrat Barack Obama received 57% of the vote, John McCain received 41%, and each of the three state row office winners (Rob McCord for Treasurer, Jack Wagner for Auditor General, and Tom Corbett for Attorney General) also carried Allegheny. In 2016, despite Donald Trump being the first Republican to carry Pennsylvania since 1988, Hillary Clinton did slightly better than Barack Obama's 2012 vote total while Donald Trump was the worst performing Republican in 20 years. In the 2018 Midterms, Democrats received an even higher percentage of the vote with Tom Wolf and Bob Casey receiving approximately two thirds of the county's vote . This is an improvement over the approximately 55% each person received in the county in their last election in 2014 and 2012 respectively.

State representatives
Robert F. Matzie, Democratic, 16th district
Jake Wheatley Jr., Democratic, 19th district
Adam Ravenstahl, Democratic, 20th district
Sara Innamorato, Democratic, 21st district
Dan Frankel, Democratic, 23rd district
Ed Gainey, Democratic, 24th district
Joseph F. Markosek, Democratic, 25th district
Daniel J. Deasy, Democratic, 27th district
Mike Turzai, Republican, 28th district
Lori Mizgorski, Republican, 30th district
Anthony M. DeLuca, Democratic, 32nd district
Frank Dermody, Democratic, 33rd district
Summer Lee, Democratic, 34th district
Austin Davis, Democratic, 35th district
Harry Readshaw, Democratic, 36th district
William C. Kortz II, Democratic, 38th district
Michael J. Puskaric, Republican, 39th district
Natalie Mihalek, Republican, 40th district
Dan L. Miller, Democratic, 42nd district
Valerie S. Gaydos, Republican, 44th district
Anita Astorino Kulik, Democratic, 45th district
Jason Ortitay, Republican, 46th district
Bob Brooks, Republican, 54th district
State senators
Pam Iovino, Democrat, 37th district
Lindsey Williams, Democrat, 38th district
Wayne D. Fontana, Democrat, 42nd district
Jay Costa, Democrat, 43rd district
James Brewster, Democrat, 45th district
U.S. representatives
Conor Lamb, Democrat, 17th district
Michael F. Doyle, Democrat, 18th district
Religion
In 2010 statistics, the largest religious group in Allegheny County was the Diocese of Pittsburgh, with 460,672 Catholics worshipping at 179 parishes, followed by 44,204 UMC Methodists with 100 congregations, 42,838 PC-USA Presbyterians with 145 congregations, 33,103 non-denominational adherents with 85 congregations, 24,718 ELCA Lutherans with 77 congregations, 17,148 ABCUSA Baptists with 42 congregations, 12,398 AoG Pentecostals with 30 congregations, 8,483 Reform Jews with 6 congregations, 7,780 TEC Episcopalians with 19 congregations, and 6,700 Hindus with two temples. Altogether, 60.6% of the population was claimed as members by religious congregations, although members of historically African-American denominations were underrepresented due to incomplete information. In 2014, Allegheny County had 794 religious organizations, the 11th most out of all US counties.

As of the 2010 census, there were 1,223,348 people living in the county. The population density was 1676 people per square mile (647/km?). The racial makeup of the county was 82.87% White, 14.39% Black or African American, 2.94% Asian, 0.03% Pacific Islander, 0.37% from other races, and 1.40% from two or more races. About 1.31% of the population were Hispanic or Latino of any race.

At the census of 2000, there were 1,281,666 people, 537,150 households, and 332,495 families living in the county. The population density was 1,755 people per square mile (678/km?). There were 583,646 housing units at an average density of 799 per square mile (309/km?). The racial makeup of the county was 84.33% White, 12.41% Black or African American, 0.12% Native American, 1.69% Asian, 0.03% Pacific Islander, 0.34% from other races, and 1.07% from two or more races. About 0.87% of the population were Hispanic or Latino of any race. 20.0% were of German, 15.0% Italian, 12.7% Irish, 7.5% Polish and 5.1% English ancestry according to Census 2000. 93.5% spoke English and 1.3% Spanish as their first language.

There were 537,150 households out of which 26.40% had children under the age of 18 living with them, 46.10% were married couples living together, 12.40% had a female householder with no husband present, and 38.10% were non-families. Some 32.70% of all households were made up of individuals and 13.20% had someone living alone who was 65 years of age or older. The average household size was 2.31 and the average family size was 2.96.

The age distribution of the population shows 21.90% under the age of 18, 8.50% from 18 to 24, 28.30% from 25 to 44, 23.40% from 45 to 64, and 17.80% who were 65 years of age or older. The median age was 40. For every 100 females, there were 90.00 males; for every 100 females age 18 and over, there were 86.20 males.

Economy
See also: Economy of Pittsburgh
In the late 18th century farming played a critical role in the growth of the area. There was a surplus of grain due to transportation difficulties in linking with the eastern portion of the state. As a result, the farmers distilled the grain into whiskey, which significantly helped the farmers financially.

Employment by occupation in Allegheny County
The area quickly became a key manufacturing area in the young nation. Coupled with deposits of iron and coal, and the easy access to waterways for barge traffic, the city quickly became one of the most important steel producing areas in the world. Based on 2007 data from the US Army Corps of Engineers, Pittsburgh is the second (after Laredo, Texas) busiest inland port in the nation.

US steel production declined late in the 20th century, and Allegheny County's economy began a shift to other industries. It is presently known for its hospitals, universities, and industrial centers. Despite the decline of heavy industry, Pittsburgh is home to a number of major companies and is ranked in the top ten among US cities hosting headquarters of Fortune 500 corporations, including U.S. Steel Corporation, PNC Financial Services Group, PPG Industries, and H. J. Heinz Company.

The county leads the state in number of defense contractors supplying the U.S. military.

Regions
East Hills
North Hills
South Hills
West Hills
City of Pittsburgh
Education
Colleges and universities
Byzantine Catholic Seminary of SS. Cyril and Methodius
Carlow University
Carnegie Mellon University
Chatham University
DeVry University
Duquesne University
La Roche College
Penn State Greater Allegheny
Pittsburgh Theological Seminary
Point Park University
Reformed Presbyterian Theological Seminary
Robert Morris University
University of Pittsburgh
Community, junior and technical colleges
Job Corps
Bidwell Training Center
Bradford School
Career Training Academy
Community College of Allegheny County
Dean Institute of Technology
Duff's Business Institute
ICM School of Business and Medical Careers
International Academy of Design and Technology
ITT Technical Institute
Le Cordon Bleu Institute of Culinary Arts in Pittsburgh
Median School of Allied Health Careers
Pittsburgh Beauty Academy
Pittsburgh Institute of Aeronautics
Pittsburgh Institute of Mortuary Science
Pittsburgh Technical Institute
Rosedale Technical Institute
Triangle Tech
Western School of Health and Business Careers
Public school districts

Map of Allegheny County, Pennsylvania Public School Districts
Allegheny Valley School District
Avonworth School District
Baldwin-Whitehall School District
Bethel Park School District
Brentwood Borough School District
Carlynton School District
Chartiers Valley School District
Clairton City School District
Cornell School District
Deer Lakes School District
Duquesne City School District
East Allegheny School District
Elizabeth Forward School District
Fort Cherry School District (part)
Fox Chapel Area School District
Gateway School District
Hampton Township School District
Highlands School District
Keystone Oaks School District
McKeesport Area School District
Montour School District
Moon Area School District
Mount Lebanon School District
North Allegheny School District
North Hills School District
Northgate School District
Penn Hills School District
Penn-Trafford School District (part)
Pine-Richland School District
Pittsburgh School District
Plum Borough School District
Quaker Valley School District
Riverview School District
Shaler Area School District
South Allegheny School District
South Fayette Township School District
South Park School District
Steel Valley School District
Sto-Rox School District
Upper St. Clair School District
West Allegheny School District
West Jefferson Hills School District
West Mifflin Area School District
Wilkinsburg School District
Woodland Hills School District
Approved private schools
The Commonwealth of Pennsylvania has 36 Approved Private Schools including the Charter Schools for the Blind and Deaf. The private schools are licensed by the State Board of Private Academic Schools. They provide a free appropriate special education for students with severe disabilities. The cost of tuition for these schools is paid 60% by the state and 40% by the local school district where the student is a resident. Pennsylvania currently has four PA chartered and 30 non-charter APSs for which the Department approves funding. These schools provide a program of special education for over 4,000 day and residential students. Parents are not charged for the services at the school. In 2009, the Pennsylvania Department of Education budgeted $98 million for the tuition of children in approved private schools and $36.8 million for students attending the charter schools for the deaf and blind. The majority of these schools are located in the southeastern region and southwestern region of Pennsylvania.

ACLD Tillotson School, Pittsburgh – Tuition rate $38,804
The Day School at The Children's Institute, Pittsburgh – Tuition rate $55,217
DePaul School for Hearing and Speech, Pittsburgh – Tuition rate $36,892
Easter Seal Society of Western Pennsylvania – Tuition rate $60,891.97
The Education Center at the Watson Institute, Sewickley – Tuition rate $42,242
Pace School, Pittsburgh – Tuition rate – $37,635
Pressley Ridge Day School, Pittsburgh – Tuition rate – $51,177
Pressley Ridge School for the Deaf, Pittsburgh – Tuition rate – $66,022, residential $128,376
The Watson Institute Friendship Academy, Pittsburgh – Tuition rate – $38,211
Wesley Spectrum Highland Services, Pittsburgh – Tuition rate – $39,031
Western Pennsylvania School for Blind Children, Pittsburgh – Tuition rate – $82,500, residential $120,100
Western Pennsylvania School for the Deaf, Pittsburgh – Tuition rate – $61,051, residential – $99,919
Private high schools
Bishop Canevin High School
Central Catholic High School
Cornerstone Christian Preparatory Academy
Eden Christian Academy
The Ellis School
Hillcrest Christian Academy
Harvest Baptist Academy
Imani Christian Academy
Oakland Catholic High School
Our Lady of the Sacred Heart High School
Serra Catholic High School
Seton-La Salle Catholic High School
Sewickley Academy
Shady Side Academy
St. Joseph High School
Vincentian Academy
Winchester Thurston School
21st Century Community Learning Centers
These are state-designated before- and after-school program providers. They receive state funding through grants. CCLCs provide academic, artistic and cultural enhancement activities to students and their families when school is not in session.

Boys & Girls Clubs of Western PA – 2010 Grant – $261,748
Cornell School District – 2010 Grant – $526,800
Human Services Center Corporation – 2010 Grant- $550,000
McKeesport Area School District – 2010 Grant – $468,000
Penn Hills School District – 2010 Grant – $360,000
The Hill House/One Small Step ?2010 Grant – $675,000
Wireless Neighborhoods – 2010 Grant – $612,000
Transportation
Allegheny County's public transportation provider is the Port Authority of Allegheny County. The Allegheny County Department of Public Works oversees infrastructure, maintenance, and engineering services in the county.

The Three Rivers Heritage Trail provides uninterrupted bicycle and pedestrian connections along the three rivers in the city, and the Great Allegheny Passage trail runs from downtown Pittsburgh to Washington, D.C.

The Allegheny County Airport is the original airport for Pittsburgh and houses a number of flight schools, charter flight operations, and medevac operations.

Major roadways
Interstate 79 runs north to south from Warrendale to Bridgeville
Interstate 279 runs north to south from Franklin Park to Downtown
Interstate 579 (Crosstown Boulevard), from Interstate 279 on the north shore to Liberty Bridge / Boulevard of the Allies
Interstate 76 / PA Turnpike runs east to west from Interstate 376 in Monroeville to the Warrendale interchange (at Interstate 79)
Interstate 376 runs east to west from Interstate 76 in Monroeville across the county to Pittsburgh International Airport and beyond
Pennsylvania Turnpike 576 (future I-576) runs south from Interstate 376 at the Pittsburgh International Airport to US Route 22, also called the Findlay Connector. The next phase of this road extension, from US Route 22 to Interstate 79 running along the County line, is currently under construction and is expected to be open to traffic in 2020.
US Route 19 runs north to south from Warrendale to Upper St. Clair
US Route 22 runs west to east, along much of US Route 30 and Interstate 376, from Imperial to Monroeville
US Route 30 runs west to east from Clinton to North Versailles, joining US 22 and Interstate 376 south of the Pittsburgh International Airport and leaving those same two routes in Wilkinsburg
For information about major state roads, see list of State Routes in Allegheny County, Pennsylvania and Allegheny County Belt System.

Parks and recreation
There are two Pennsylvania state parks in Allegheny County. Point State Park is at the confluence of the Allegheny and Monongahela rivers in Downtown Pittsburgh, and Allegheny Islands State Park is in the Allegheny River in Harmar Township and is undeveloped as of August 2010.

Pennsylvania State Game Lands Number 203 is also located in Allegheny County providing hunting and other activities.

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The regional parks of Allegheny County in the U.S. state of Pennsylvania
Sports
Pittsburgh Steelers, football team
Pittsburgh Penguins, ice hockey team
Pittsburgh Pirates, baseball team
Pittsburgh Riverhounds, soccer team
Pittsburgh Passion, Women's Football Alliance team
Pittsburgh Thunderbirds, American Ultimate Disc League team
Steel City Roller Derby, Women's Flat Track Derby Association team
Communities

Map of Allegheny County, Pennsylvania, with municipal labels showing cities and boroughs (red), Townships (white), and census-designated places (blue)
Under Pennsylvania law, there are four types of incorporated municipalities: cities, boroughs, townships, and (in one case) a town. The following municipalities are in Allegheny County:

Cities
Clairton
Duquesne
McKeesport
Pittsburgh (county seat)
Boroughs
Aspinwall
Avalon
Baldwin
Bell Acres
Bellevue
Ben Avon
Ben Avon Heights
Bethel Park
Blawnox
Brackenridge
Braddock
Braddock Hills
Bradford Woods
Brentwood
Bridgeville
Carnegie
Castle Shannon
Chalfant
Cheswick
Churchill
Coraopolis
Crafton
Dormont
Dravosburg
East McKeesport
East Pittsburgh
Edgewood
Edgeworth
Elizabeth
Emsworth
Etna
Forest Hills
Fox Chapel
Franklin Park
Glassport
Glen Osborne
Glenfield
Green Tree
Haysville
Heidelberg
Homestead
Ingram
Jefferson Hills
Leetsdale
Liberty
Lincoln
McDonald (mostly in Washington County)
McKees Rocks
Millvale
Monroeville
Mount Oliver
Munhall
North Braddock
Oakdale
Oakmont
Pennsbury Village
Pitcairn
Pleasant Hills
Plum
Port Vue
Rankin
Rosslyn Farms
Sewickley
Sewickley Heights
Sewickley Hills
Sharpsburg
Springdale
Swissvale
Tarentum
Thornburg
Trafford (mostly in Westmoreland County)
Turtle Creek
Verona
Versailles
Wall
West Elizabeth
West Homestead
West Mifflin
West View
Whitaker
White Oak
Whitehall
Wilkinsburg
Wilmerding
Townships
Aleppo
Baldwin
Collier
Crescent
East Deer
Elizabeth
Fawn
Findlay
Forward
Frazer
Hampton
Harmar
Harrison
Indiana
Kennedy
Kilbuck
Leet
Marshall
McCandless
Moon
Mt. Lebanon
Neville
North Fayette
North Versailles
O'Hara
Ohio
Penn Hills
Pine
Reserve
Richland
Robinson
Ross
Scott
Shaler
South Fayette
South Park
South Versailles
Springdale
Stowe
Upper Saint Clair
West Deer
Wilkins
Census-designated places
Census-designated places are geographical areas designated by the US Census Bureau for the purposes of compiling demographic data. They are not actual jurisdictions under Pennsylvania law. Other unincorporated communities, such as villages, may be listed here as well.

Allison Park
Bairdford
Bakerstown
Boston
Carnot-Moon
Clinton
Curtisville
Enlow
Gibsonia
Glenshaw
Greenock
Harwick
Imperial
Noblestown
Rennerdale
Russellton
Sturgeon
Unincorporated communities
Acmetonia
Alpsville
Blackridge
Blanchard
Broughton
Bruceton
Buena Vista
Creighton
Cubbage Hill
Cuddy
Dorseyville
Ewingsville
Harmarville
Hickory Heights
Indianola
Ingomar
Karns
Keown Station
Kirwan Heights
Library
McKnight
Moon Run
Mount Vernon
Natrona
Natrona Heights
Nevillewood
Presto
Regent Square
Rural Ridge
Sheraden
Treveskyn
Warrendale
Wexford
Wildwood
Former places
Many political subdivisions of Allegheny County have come and gone through subdivision or annexation through the years. These include:

Allegheny City – the area that is now the North Shore (or North Side) of the City of Pittsburgh, north of the Allegheny River.
Allentown Borough – now the neighborhood of Allentown in Pittsburgh.
Birmingham Borough – what is now Pittsburgh's South Side.
Brushton Borough
Carrick Borough – now the neighborhood of Carrick. Formed out of Baldwin Township in 1904, this borough existed until it was annexed by Pittsburgh in 1927. It was named for Carrick-on-Suir, Ireland. Some of the area's manhole covers still bear the Carrick Borough name.
Chartier Township – existed at the time of the 1860 U.S. Federal Census.
Collins Township – in what is now the northeast part of the City of Pittsburgh, east of Lawrenceville and north of Penn Avenue.
Knoxville Borough
Lawrenceville Borough
McClure Township – McClure was formed in 1858 from the section of Ross Township adjacent to Allegheny City. In 1867 McClure, along with sections of Reserve Township, was incorporated into Allegheny City. The McClure section of this annexation became Wards 9 (Woods Run Area) and 11 (present-day Brighton Heights) in the City of Pittsburgh.
Mifflin Township- comprised the modern day communities of Whitaker, West Mifflin, West Homestead, West Elizabeth, Pleasant Hills, Munhall, Lincoln Place, Jefferson Hills, Homestead, Hays, Duquesne, Dravosburg, Clairton and part of Baldwin.
Patton Township – was in the east-central part of the county, north of North Versailles Township, east of Wilkins and Penn Townships, and south of Plum Township. In the U.S. census for 1860–1880. In 1951 it became incorporated as the borough of Monroeville.
Northern Liberties Borough – in what is now the Strip District of Pittsburgh. The borough was annexed to Pittsburgh in 1837 as the first addition to the city's original territory.
Peebles Township – included most of what is now the eastern part of the city of Pittsburgh from the Monongahela River in the south (today's Hazelwood) to the Allegheny River in the north. It was subdivided into Collins and Liberty townships, all of which were incorporated into Pittsburgh in 1868.
Pitt Township
St. Clair Township – stretched from the Monongahela River south to the Washington County line. It divided into Lower St. Clair, which eventually became part of the City of Pittsburgh, Dormont, Mount Lebanon, and Upper St. Clair.
Snowden – now known as South Park Township.
Sterrett Township
Temperanceville – what is now Pittsburgh's West End.
Union Borough – the area surrounding Temperanceville.
West Liberty Borough – now the neighborhoods of Brookline and Beechview in Pittsburgh.
Population ranking
The population ranking of the following table is based on the 2010 census of Allegheny County.

† county seat

Rank City/Town/etc. Population (2010 Census) Municipal type Incorporated
1 † Pittsburgh 305,704 City 1794 (borough) 1816 (city)
2 Penn Hills 42,329 Municipality 1851 (Penn Twp.) 1958 (Penn Hills Twp.) 1976 (municipality)
3 Mt. Lebanon 33,137 Municipality 1912 (township) 1975 (municipality)
4 Bethel Park 32,313 Municipality 1949 (borough) 1978 (municipality)
5 Ross 31,105 Municipality 1809
6 Monroeville 28,386 Municipality 1951
7 Plum 27,126 Borough 1788 (township) 1956 (borough)
8 Allison Park 21,552 CDP
9 West Mifflin 20,313 Borough 1942
10 Baldwin 19,767 Borough 1950
11 McKeesport 19,731 City 1842 (borough) 1891 (city)
12 Wilkinsburg 15,930 Borough 1871 (Sterrett Twp.) 1887 (borough)
13 Whitehall 13,944 Borough 1948
14 Franklin Park 13,470 Borough
15 Munhall 11,406 Borough
16 Carnot-Moon 11,372 CDP
17 Jefferson Hills 10,619 Borough
18 Brentwood 9,643 Borough 1916
19 Swissvale 8,983 Borough
20 Glenshaw 8,981 CDP
21 Dormont 8,593 Borough 1909
22 Bellevue 8,370 Borough 1867
23 Castle Shannon 8,316 Borough 1919
24 Pleasant Hills 8,268 Borough
25 Carnegie 7,972 Borough 1894
26 White Oak 7,862 Borough
27 Clairton 6,796 City 1903 (borough) 1922 (city)
28 West View 6,771 Borough
29 Forest Hills 6,518 Borough 1919
30 Oakmont 6,303 Borough 1889
31 McKees Rocks 6,104 Borough 1892
32 Crafton 5,951 Borough
33 Coraopolis 5,677 Borough 1886
34 Duquesne 5,565 City 1891 (borough) 1918 (city)
35 Fox Chapel 5,388 Borough
36 Turtle Creek 5,349 Borough
37 Bridgeville 5,148 Borough 1901
38 North Braddock 4,857 Borough
39 Avalon 4,705 Borough 1874
40 Tarentum 4,530 Borough 1842
41 Glassport 4,483 Borough
42 Green Tree 4,432 Borough 1885
43 Sewickley 3,827 Borough
44 Port Vue 3,798 Borough
45 Millvale 3,744 Borough
46 Pitcairn 3,689 Borough
47 Etna 3,451 Borough
48 Sharpsburg 3,446 Borough
49 Springdale 3,405 Borough
50 Mount Oliver 3,403 Borough
51 Ingram 3,330 Borough
52 Brackenridge 3,260 Borough 1901
53 Trafford (mostly in Westmoreland County) 3,174 Borough 1904
54 Homestead 3,165 Borough
55 Edgewood 3,118 Borough 1888
56 Churchill 3,011 Borough
57 Aspinwall 2,801 Borough 1892
58 Gibsonia 2,733 CDP
59 Liberty 2,551 Borough
60 Imperial 2,541 CDP
61 Verona 2,474 Borough 1871
62 Emsworth 2,449 Borough
63 Greenock 2,195 CDP
64 Wilmerding 2,190 Borough
65 Braddock 2,159 Borough 1867
66 McDonald (mostly in Washington County) 2,149 Borough 1889
67 East McKeesport 2,126 Borough
68 Rankin 2,122 Borough
69 West Homestead 1,929 Borough
70 Braddock Hills 1,880 Borough 1946
71 East Pittsburgh 1,822 Borough
72 Dravosburg 1,792 Borough
73 Ben Avon 1,781 Borough 1891
74 Bakerstown 1,761 CDP
75 Cheswick 1,746 Borough
76 Sturgeon 1,710 CDP
77 Edgeworth 1,680 Borough
78 Versailles 1,515 Borough
79 Elizabeth 1,493 Borough
80 Oakdale 1,459 Borough
81 Russellton 1,440 CDP
82 Blawnox 1,432 Borough 1925
83 Bell Acres 1,388 Borough 1960
84 Whitaker 1,271 Borough
85 Heidelberg 1,244 Borough
86 Leetsdale 1,218 Borough
87 Bradford Woods 1,171 Borough 1915
88 Rennerdale 1,150 CDP
89 Lincoln 1,072 Borough
90 Curtisville 1,064 CDP
91 Enlow 1,013 CDP
92 Harwick 899 CDP
93 Sewickley Heights 810 Borough
94 Chalfant 800 Borough
95 Bairdford 698 CDP
96 Pennsbury Village 661 Borough
97 Sewickley Hills 639 Borough
98 Wall 580 Borough
99 Noblestown 575 CDP
100 Glen Osborne 547 Borough
101 Boston 545 CDP
102 West Elizabeth 518 Borough
103 Thornburg 455 Borough
104 Clinton 434 CDP
105 Rosslyn Farms 427 Borough
106 Ben Avon Heights 371 Borough 1913
107 Glenfield 205 Borough
108 Haysville 70 Borough
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