County Maps US

Lehigh County, Pennsylvania

A county in Pennsylvania, ranked 10 of 67 by population.

CountyFIPS 42077

Within Pennsylvania
Lehigh County, highlighted, with the areas around it. Boundaries generalised from the 2025 Census cartographic boundary file; neighbour fills carry no data. The dot marks Allentown, the county seat, located via the 2025 Census Gazetteer.

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Population
384,383
+9,934 (+2.7%) since 2020
Land area
345.3
square miles. A further 0.8% of the total area is water
Population density
1,113
people per square mile, computed rather than published
County seat
Allentown
Seat of county government.
Established
1812
213 years ago
Largest city
Allentown city
Population 126,044.

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; Wikidata (CC0), Wikidata. Retrieved 30 August 2026.

Satellite view

Aerial imagery of Lehigh County with its boundary drawn on top. A map shows you the shape; this shows you what is inside it, and which side of the line a place falls on.

Aerial view of Lehigh County, Pennsylvania from the USGS National Map, with its boundary outlined
Imagery: USGS National Map, USGS Imagery Only, public domain, requested from USGS by your browser when you reach this point on the page, at 800 by 708 pixels. The boundary is the 2025 Census cartographic boundary file, reprojected to Web Mercator to match the imagery. You can also open the USGS National Map viewer.

Where Lehigh County ranks

Position among the 67 counties of Pennsylvania, and among all 3,144 US counties and county-equivalents. Computed from the figures on this page.

MeasureValueIn PennsylvaniaNationally
Population384,38310th of 67201st of 3,144
Land area345.3 sq mi62nd of 672,691st of 3,144
Population density1,113 per sq mi5th of 67146th of 3,144
Median household income$80,07913th of 67583rd of 3,143

Full data for Lehigh County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population384,383Vintage 2025 Population Estimates
Population in 2020374,449Vintage 2025 Population Estimates
2020 estimates base?374,546Vintage 2025 Population Estimates
Land area345.3 sq mi2025 Gazetteer Files
Water area2.9 sq mi2025 Gazetteer Files
Total area348.2 sq mi2025 Gazetteer Files
Population density?1,113 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$80,079American Community Survey 2020-2024 5-Year Estimates
Median home value$300,400American Community Survey 2020-2024 5-Year Estimates
Median age39.6American Community Survey 2020-2024 5-Year Estimates
Households144,386American Community Survey 2020-2024 5-Year Estimates
Housing units151,220American Community Survey 2020-2024 5-Year Estimates

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; US Census Bureau, American Community Survey, American Community Survey 2020-2024 5-Year Estimates, released 29 January 2026. Population density is computed here, not published: it divides the Vintage 2025 population estimate by the 2025 Gazetteer land area, which are two different Census products. Retrieved 30 August 2026.

How the population changed

The Census Bureau publishes the components behind an estimate, not just the total. For the year to July 2025:

Births minus deaths
+210
3,749 births, 3,539 deaths
Net migration
+1,213
More people moved in than moved out.

Source: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026. Retrieved 30 August 2026.

The 6 areas bordering Lehigh County

Ordered by the length of the border actually shared, which the Census Bureau publishes in its county adjacency file and which no other county reference presents.

Bordering areaStateShared borderPopulation
Northampton CountyPennsylvania31 mi324,411
Berks CountyPennsylvania25 mi440,072
Bucks CountyPennsylvania11 mi647,828
Carbon CountyPennsylvania9.0 mi65,868
Schuylkill CountyPennsylvania8.3 mi145,085
Montgomery CountyPennsylvania3.1 mi877,643

Source: US Census Bureau, County Adjacency File, 2025 County Adjacency File, released 15 September 2025. Retrieved 30 August 2026.

All 67 counties of Pennsylvania

Open the interactive Pennsylvania county map, or jump straight to any of them.

Data on this page last rebuilt 30 August 2026. How these figures are produced.