County Maps US

Simpson County, Mississippi

A county in Mississippi, ranked 35 of 82 by population.

CountyFIPS 28127

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

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Population
25,498
-389 (-1.5%) since 2020
Land area
589.2
square miles. A further 0.2% of the total area is water
Population density
43.3
people per square mile, computed rather than published
County seat
Mendenhall
Seat of county government.
Established
1824
201 years ago
Largest city
Magee city
Population 3,904.

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 Simpson 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 Simpson 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 800 by 506 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 Simpson 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
Population25,49835th of 821,607th of 3,144
Land area589.2 sq mi34th of 821,663rd of 3,144
Population density43.3 per sq mi40th of 821,602nd of 3,144
Median household income$56,38119th of 822,386th of 3,143

Full data for Simpson County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population25,498Vintage 2025 Population Estimates
Population in 202025,887Vintage 2025 Population Estimates
2020 estimates base?25,941Vintage 2025 Population Estimates
Land area589.2 sq mi2025 Gazetteer Files
Water area1.3 sq mi2025 Gazetteer Files
Total area590.5 sq mi2025 Gazetteer Files
Population density?43.3 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$56,381American Community Survey 2020-2024 5-Year Estimates
Median home value$122,200American Community Survey 2020-2024 5-Year Estimates
Median age40.6American Community Survey 2020-2024 5-Year Estimates
Households9,543American Community Survey 2020-2024 5-Year Estimates
Housing units11,694American 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
-56
280 births, 336 deaths
Net migration
-64
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 Simpson 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
Copiah CountyMississippi39 mi27,497
Rankin CountyMississippi29 mi162,181
Smith CountyMississippi22 mi13,991
Jefferson Davis CountyMississippi13 mi10,941
Lawrence CountyMississippi8.7 mi11,819
Covington CountyMississippi6.0 mi17,898
Hinds CountyMississippia single point211,888

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.