County Maps US

Lancaster County, Pennsylvania

A county in Pennsylvania, ranked 6 of 67 by population.

CountyFIPS 42071

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

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Population
563,159
+10,340 (+1.9%) since 2020
Land area
943.9
square miles. A further 4.1% of the total area is water
Population density
597
people per square mile, computed rather than published
County seat
Lancaster
Seat of county government.
Established
1729
296 years ago
Largest city
Lancaster city
Population 58,366.

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 Lancaster 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 Lancaster 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 740 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 Lancaster 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
Population563,1596th of 67127th of 3,144
Land area943.9 sq mi12th of 67754th of 3,144
Population density597 per sq mi9th of 67242nd of 3,144
Median household income$86,9598th of 67374th of 3,143

Full data for Lancaster County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population563,159Vintage 2025 Population Estimates
Population in 2020552,819Vintage 2025 Population Estimates
2020 estimates base?552,988Vintage 2025 Population Estimates
Land area943.9 sq mi2025 Gazetteer Files
Water area39.9 sq mi2025 Gazetteer Files
Total area983.8 sq mi2025 Gazetteer Files
Population density?597 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$86,959American Community Survey 2020-2024 5-Year Estimates
Median home value$301,100American Community Survey 2020-2024 5-Year Estimates
Median age39.4American Community Survey 2020-2024 5-Year Estimates
Households212,748American Community Survey 2020-2024 5-Year Estimates
Housing units219,224American 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
+1,428
6,779 births, 5,351 deaths
Net migration
-344
More people moved out than moved in.

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

The 7 areas bordering Lancaster 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
Chester CountyPennsylvania48 mi557,116
York CountyPennsylvania44 mi473,197
Lebanon CountyPennsylvania24 mi146,380
Berks CountyPennsylvania19 mi440,072
Dauphin CountyPennsylvania14 mi293,351
Cecil CountyMaryland5.2 mi107,131
Harford CountyMaryland0.3 mi266,446

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

Side by side

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.