Allegheny County, Pennsylvania

County seat: Pittsburgh · Population 1.2 million (2025) · 730 sq mi

Allegheny County is the 2nd most populous of Pennsylvania's 67 counties, with 1,225,035 people (2025 estimate). Its county seat is Pittsburgh. It is part of the District 11 region, one of the 11 PennDOT engineering districts. The map shows its 90 cities and towns and the 4 neighboring counties.

Map of Allegheny County, Pennsylvania with cities, towns and the county boundary
Allegheny County, Pennsylvania with its cities and towns, unincorporated communities (CDPs) and neighboring counties. Boundaries: U.S. Census Bureau, 2025. Free to use with attribution (CC BY 4.0).
Download PDF (Letter) 253 KBPNG image 163 KBPennsylvania county map

Allegheny County facts

County seat
Pittsburgh
Population (2025 estimate)
1,225,035 −2% since 2020
Land area
730 sq mi 29th largest of 67
Water area
14 sq mi
Population density
1,678 per sq mi
Established
1788
Named after
Allegheny River river in western Pennsylvania and New York, United States
Largest city
Pittsburgh 307,632
Median household income
$78,548
Cities and towns
90 plus 27 CDPs
ZIP codes
119
Time zone
Eastern
FIPS code
42003

Cities and towns in Allegheny County

Allegheny County has 90 incorporated cities, towns and villages. Populations count the people living inside Allegheny County; cities that cross a county line also list the other counties.

NameTypePopulation 2025Also in
Pittsburgh (county seat)City307,632
Penn HillsMunicipality39,452
Mount LebanonMunicipality32,552
Bethel ParkMunicipality32,074
MonroevilleMunicipality27,685
PlumBorough26,225
BaldwinBorough20,516
West MifflinBorough18,707
McKeesportCity16,907
Franklin ParkBorough14,978
WhitehallBorough14,521
WilkinsburgBorough13,602
Jefferson HillsBorough12,357
MunhallBorough10,253
BrentwoodBorough9,597
Pleasant HillsBorough8,212
SwissvaleBorough8,197
Castle ShannonBorough8,006
BellevueBorough7,888
DormontBorough7,816
CarnegieBorough7,777
White OakBorough7,286
OakmontBorough6,576
West ViewBorough6,355
Forest HillsBorough6,116
ClairtonMunicipality5,876
CraftonBorough5,790
McKees RocksBorough5,624
CoraopolisBorough5,280
Fox ChapelBorough5,139
DuquesneCity5,019
Turtle CreekBorough4,865
Green TreeBorough4,672
AvalonBorough4,572
BridgevilleBorough4,569
GlassportBorough4,251
TarentumBorough4,127
North BraddockBorough4,107
SewickleyBorough3,729
Port VueBorough3,519
EtnaBorough3,269
SpringdaleBorough3,234
IngramBorough3,222
Mount OliverBorough3,222
MillvaleBorough3,211
BrackenridgeBorough3,093
ChurchillBorough3,014
EdgewoodBorough2,997
SharpsburgBorough2,990
PitcairnBorough2,953
HomesteadBorough2,822
AspinwallBorough2,809
VeronaBorough2,396
EmsworthBorough2,377
LibertyBorough2,242
RankinBorough1,975
East McKeesportBorough1,969
East PittsburghBorough1,835
Ben AvonBorough1,824
West HomesteadBorough1,778
WilmerdingBorough1,700
Braddock HillsBorough1,650
BraddockBorough1,647
EdgeworthBorough1,611
CheswickBorough1,594
DravosburgBorough1,536
Bell AcresBorough1,454
OakdaleBorough1,413
VersaillesBorough1,406
BlawnoxBorough1,384
ElizabethBorough1,343
HeidelbergBorough1,230
Bradford WoodsBorough1,126
WhitakerBorough1,123
LeetsdaleBorough1,102
LincolnBorough888
Sewickley HeightsBorough827
ChalfantBorough710
Sewickley HillsBorough681
Pennsbury VillageBorough644
Glen OsborneBorough558
WallBorough493
ThornburgBorough447
Rosslyn FarmsBorough419
West ElizabethBorough385
Ben Avon HeightsBorough376
McDonaldBorough371Washington County
GlenfieldBorough200
TraffordBorough90Westmoreland County
HaysvilleBorough77

Unincorporated communities (CDPs)

Census-designated places are communities without their own city government; the county provides their services.

CommunityPopulationAlso in
Allison Park22,045
Carnot-Moon13,534
Glenshaw9,139
Natrona Heights6,903
Imperial3,001
Gibsonia2,899
Bakerstown2,527
Greenock1,815
Sturgeon1,466
Glendale1,408
Russellton1,333
Rennerdale1,067
Enlow1,019
Curtisville989
Dorseyville941
Clinton899
Harwick899
Natrona869
Bairdford706
Noblestown616
Blaine Hill587
West Wilmerding475
Industry406
Buena Vista301
Coulter236
Boston162
Bunola134

ZIP codes in Allegheny County

119 ZIP codes reach into Allegheny County. ZIP codes ignore county lines, so some also cover a neighboring county.

Population of Allegheny County, 2020–2025

Allegheny County shrank by 25,546 people (−2%) between April 2020 and July 2025: 13,027 more deaths than births and a net loss of 13,713 people from migration.

Year (July 1)Population
20201,249,585
20211,245,335
20221,233,325
20231,228,911
20241,227,174
20251,225,035

Neighboring counties

Printable Allegheny County map

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Sources

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