County Maps US

Atchison County, Kansas

A county in Kansas, ranked 31 of 105 by population.

CountyFIPS 20005

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

Download SVGFull Kansas map downloads

Population
16,172
-153 (-0.9%) since 2020
Land area
431.2
square miles. A further 0.6% of the total area is water
Population density
37.5
people per square mile, computed rather than published
County seat
Atchison
Seat of county government.
Established
1855
170 years ago
Largest city
Atchison city
Population 10,789.

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 Atchison 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 Atchison 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 800 by 446 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 Atchison 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
Population16,17231st of 1052,029th of 3,144
Land area431.2 sq mi102nd of 1052,355th of 3,144
Population density37.5 per sq mi18th of 1051,732nd of 3,144
Median household income$61,11269th of 1051,979th of 3,143

Full data for Atchison County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population16,172Vintage 2025 Population Estimates
Population in 202016,325Vintage 2025 Population Estimates
2020 estimates base?16,345Vintage 2025 Population Estimates
Land area431.2 sq mi2025 Gazetteer Files
Water area2.6 sq mi2025 Gazetteer Files
Total area433.8 sq mi2025 Gazetteer Files
Population density?37.5 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$61,112American Community Survey 2020-2024 5-Year Estimates
Median home value$145,700American Community Survey 2020-2024 5-Year Estimates
Median age36.1American Community Survey 2020-2024 5-Year Estimates
Households5,735American Community Survey 2020-2024 5-Year Estimates
Housing units6,817American 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
-36
158 births, 194 deaths
Net migration
+38
More people moved in than moved out.

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

The 7 areas bordering Atchison 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
Jefferson CountyKansas21 mi18,296
Doniphan CountyKansas18 mi7,594
Jackson CountyKansas16 mi13,438
Brown CountyKansas12 mi9,104
Platte CountyMissouri11 mi114,400
Leavenworth CountyKansas11 mi84,590
Buchanan CountyMissouri8.6 mi83,540

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.