Lehigh County, Pennsylvania

County seat: Allentown · Population 384,383 (2025) · 345 sq mi

Lehigh County is the 10th most populous of Pennsylvania's 67 counties, with 384,383 people (2025 estimate). Its county seat is Allentown. It is part of the District 5 region, one of the 11 PennDOT engineering districts. The map shows its 10 cities and towns and the 6 neighboring counties.

Map of Lehigh County, Pennsylvania with cities, towns and the county boundary
Lehigh 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) 129 KBPNG image 98 KBPennsylvania county map

Lehigh County facts

County seat
Allentown
Population (2025 estimate)
384,383 +2.6% since 2020
Land area
345 sq mi 62nd largest of 67
Water area
3 sq mi
Population density
1,113 per sq mi
Established
1812
Named after
Lehigh River river located in eastern Pennsylvania, in the United States
Largest city
Allentown 126,044
Median household income
$80,079
Cities and towns
10 plus 16 CDPs
ZIP codes
36
Time zone
Eastern
FIPS code
42077

Cities and towns in Lehigh County

Lehigh County has 10 incorporated cities, towns and villages. Populations count the people living inside Lehigh County; cities that cross a county line also list the other counties.

NameTypePopulation 2025Also in
Allentown (county seat)City126,044
BethlehemCity20,274Northampton County
EmmausBorough12,514
CatasauquaBorough6,590
Fountain HillBorough4,835
SlatingtonBorough4,296
CoplayBorough3,532
MacungieBorough3,395
AlburtisBorough2,609
CoopersburgBorough2,535

Unincorporated communities (CDPs)

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

CommunityPopulationAlso in
Fullerton16,724
Ancient Oaks7,777
Breinigsville7,769
Wescosville7,148
Dorneyville5,211
Schnecksville3,922
Hokendauqua3,145
Egypt3,053
Trexlertown2,416
Cetronia2,120
Cementon1,454
Stiles1,441
DeSales University1,052
Laurys Station744
New Tripoli717
Slatedale303

ZIP codes in Lehigh County

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

Population of Lehigh County, 2020–2025

Lehigh County grew by 9,837 people (+2.6%) between April 2020 and July 2025: 453 more births than deaths and a net gain of 9,186 people from migration.

Year (July 1)Population
2020374,449
2021375,852
2022376,746
2023380,068
2024382,939
2025384,383

Neighboring counties

Printable Lehigh County map

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Sources

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