County Maps US

Washington County, Mississippi

A county in Mississippi, ranked 18 of 82 by population.

CountyFIPS 28151

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

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Population
40,446
-4,193 (-9.4%) since 2020
Land area
724.1
square miles. A further 4.8% of the total area is water
Population density
55.9
people per square mile, computed rather than published
County seat
Greenville
Seat of county government.
Established
1827
198 years ago
Largest city
Greenville city
Population 26,530.

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 Washington 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 Washington County, Mississippi 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 722 by 800 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 Washington County ranks

Position among the 82 counties of Mississippi, and among all 3,144 US counties and county-equivalents. Computed from the figures on this page.

MeasureValueIn MississippiNationally
Population40,44618th of 821,183rd of 3,144
Land area724.1 sq mi13th of 821,228th of 3,144
Population density55.9 per sq mi26th of 821,371st of 3,144
Median household income$42,16562nd of 823,023rd of 3,143

Full data for Washington County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population40,446Vintage 2025 Population Estimates
Population in 202044,639Vintage 2025 Population Estimates
2020 estimates base?44,918Vintage 2025 Population Estimates
Land area724.1 sq mi2025 Gazetteer Files
Water area36.2 sq mi2025 Gazetteer Files
Total area760.4 sq mi2025 Gazetteer Files
Population density?55.9 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$42,165American Community Survey 2020-2024 5-Year Estimates
Median home value$104,000American Community Survey 2020-2024 5-Year Estimates
Median age38.0American Community Survey 2020-2024 5-Year Estimates
Households17,113American Community Survey 2020-2024 5-Year Estimates
Housing units20,867American 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
-85
530 births, 615 deaths
Net migration
-683
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 6 areas bordering Washington 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
Chicot CountyArkansas96 mi9,107
Bolivar CountyMississippi26 mi28,262
Sunflower CountyMississippi21 mi22,893
Sharkey CountyMississippi19 mi3,097
Humphreys CountyMississippi18 mi7,001
Issaquena CountyMississippi15 mi1,263

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

All 82 counties of Mississippi

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

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