Washington County, Pennsylvania

Washington County population, land area and income

Washington County had 210,434 residents in the Census Vintage 2024 estimate, on 857.0 square miles of land. It ranks 18th of 67 in Pennsylvania by population and 18th by land area. That works out to 245.5 people per square mile, 2.6 times the US average of 96.3, and in the top quarter nationally.

The median county-equivalent in Pennsylvania has 82,953 residents, so Washington County is 2.5 times that size.

Its SAIPE 2023 median household income of $76,957 is in the top quarter among 3,143 counties with an estimate.

How Washington County's population changed since 2020

Washington County gained 1,020 residents between the July 2020 and July 2024 estimates, a rise of 0.5%. That ranks 27th of 67 in Pennsylvania for growth. The median Pennsylvania county changed by -0.5%, and the state as a whole by +0.6%.

Since the April 2020 estimates base, Washington County recorded 7,874 births and 11,810 deaths, a natural change of -3,936. Net international migration added +829 and net domestic migration, people moving to or from other US counties, came to +4,216. The largest single component was domestic migration, which added 4,216 people.

Where Washington County is

The Census internal point of Washington County is at 40.200000, -80.252100. It sits in UTM zone 17N. The map shades Pennsylvania's 67 county-equivalents by population change from 2020 to 2024, darker for faster growth, with Washington County outlined. Dots are towns of 1,000+ people with residents in it.

Towns in Washington County

15 incorporated places of 1,000+ people have residents in Washington County, 56,188 people together, or 27% of the county. Each figure counts only the part of the town inside Washington County; towns marked "part" extend into another county. The largest is Washington with 13,334.

Counties bordering Washington County

The Census 2024 county adjacency file lists 9 neighbors for Washington County, including 4 across a state line. The most populous is Allegheny County, PA, with 1,231,814 residents. Distances run between Census internal points in a straight line.

• Allegheny County

  1,231,814 people

  23 mi NE

• Westmoreland County

  350,935 people

  42 mi E

• Beaver County

  165,540 people

  34 mi N

• Fayette County

  123,941 people

  38 mi ESE

• WV

  Ohio County, WV

  41,090 people

  21 mi WSW

• Greene County

  33,960 people

  24 mi S

• WV

  Marshall County, WV

  29,354 people

  33 mi SW

• WV

  Hancock County, WV

  28,054 people

  28 mi NW

• WV

  Brooke County, WV

  21,285 people

  18 mi WNW

Distance to Harrisburg and the nearest big city

Harrisburg is 177.7 miles E of Washington County's internal point in a straight line. The nearest place of 100,000 or more is Pittsburgh, PA (population 307,668), 22.1 miles away. The nearest place of 10,000 or more is Washington, PA (population 13,334), 1.8 miles away.

Washington County FIPS code

The FIPS code of Washington County is 42125: state code 42 for Pennsylvania plus county code 125. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $76,957.