County Maps US

Nemaha County, Kansas

A county in Kansas, ranked 38 of 105 by population.

CountyFIPS 20131

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

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Population
10,054
-214 (-2.1%) since 2020
Land area
717.4
square miles. A further 0.3% of the total area is water
Population density
14.0
people per square mile, computed rather than published
County seat
Seneca
Seat of county government.
Established
1855
170 years ago
Largest city
Sabetha city
Population 2,467 for the whole place, which extends beyond this county.

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 Nemaha 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 Nemaha County, Kansas 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 656 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 Nemaha County ranks

Position among the 105 counties of Kansas, and among all 3,144 US counties and county-equivalents. Computed from the figures on this page.

MeasureValueIn KansasNationally
Population10,05438th of 1052,401st of 3,144
Land area717.4 sq mi63rd of 1051,256th of 3,144
Population density14.0 per sq mi41st of 1052,423rd of 3,144
Median household income$77,34813th of 105708th of 3,143

Full data for Nemaha County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population10,054Vintage 2025 Population Estimates
Population in 202010,268Vintage 2025 Population Estimates
2020 estimates base?10,279Vintage 2025 Population Estimates
Land area717.4 sq mi2025 Gazetteer Files
Water area2.0 sq mi2025 Gazetteer Files
Total area719.4 sq mi2025 Gazetteer Files
Population density?14.0 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$77,348American Community Survey 2020-2024 5-Year Estimates
Median home value$217,200American Community Survey 2020-2024 5-Year Estimates
Median age40.1American Community Survey 2020-2024 5-Year Estimates
Households4,031American Community Survey 2020-2024 5-Year Estimates
Housing units4,512American 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
+7
144 births, 137 deaths
Net migration
-39
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 Nemaha 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
Marshall CountyKansas30 mi9,852
Brown CountyKansas24 mi9,104
Jackson CountyKansas19 mi13,438
Pawnee CountyNebraska12 mi2,510
Richardson CountyNebraska12 mi7,530
Pottawatomie CountyKansas11 mi27,186

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

All 105 counties of Kansas

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

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