County facts · Population · October 25, 2026

Kansas Population by County, 2025 Census Estimates

Kansas population by county: July 2025 Census estimates for all 105 counties, change since 2020, density, and a link to each official parcel map.

Looking for Kansas population by county? The Census Bureau estimates that Kansas had 2,977,220 residents on July 1, 2025, spread across 105 counties. Johnson County is the most populous, with 636,906 people (21% of the state), and Greeley County is the least populous, with 1,182.

The table below lists every county with its 2025 estimate, its April 2020 starting point, the change, people per square mile, and a link to its official parcel viewer.

Kansas population at a glance

• Counties: 105
• Statewide, July 1, 2025: 2,977,220 (April 1, 2020 estimates base: 2,937,986; change +39,234, +1.3%)
• Most populous: Johnson County (636,906); least populous: Greeley County (1,182)
• Median county: about 7,018 residents (half of the counties are smaller)
• The 5 largest counties hold 55% of all Kansas residents
• Counties with 1,000,000+ residents: 0 · 100,000+: 5 · under 10,000: 67
• Statewide density: about 36 people per square mile of land

Kansas population by county, July 2025 (all 105)

Percent change runs from the April 1, 2020 estimates base to July 1, 2025. People per square mile is the July 2025 estimate divided by the county's land area in the Census Bureau's 2020 Gazetteer file, so lakes and bays are left out.

How Kansas's population is spread out

Grouping the counties by size shows how concentrated the state is:

2 counties with at least 250,000 residents hold 39% of the state's population.

Most and least densely populated

The most crowded counties by people per square mile of land:

1. Johnson County: 1,345 per sq mi (636,906 people on 474 sq mi)
2. Wyandotte County: 1,125 per sq mi (170,597 people on 152 sq mi)
3. Sedgwick County: 540 per sq mi (538,433 people on 997 sq mi)
4. Shawnee County: 328 per sq mi (178,607 people on 544 sq mi)
5. Douglas County: 265 per sq mi (120,920 people on 456 sq mi)

The most thinly settled:

1. Greeley County: 1.5 per sq mi (1,182 people on 778 sq mi)
2. Wallace County: 1.6 per sq mi (1,441 people on 914 sq mi)
3. Hodgeman County: 1.9 per sq mi (1,619 people on 860 sq mi)
4. Clark County: 1.9 per sq mi (1,900 people on 975 sq mi)
5. Lane County: 2.1 per sq mi (1,508 people on 717 sq mi)

About these numbers

• They are estimates. Between censuses the Census Bureau's Population Estimates Program updates county totals each year from births, deaths and migration records. The next full count is the 2030 census.
• The base is April 1, 2020. The estimates start from an April 1, 2020 "estimates base" built from the 2020 census, which is why it is slightly different from the published census count.
• Each new release revises the past. A newer vintage can change earlier years as well, so compare numbers from the same release, as this page does.
• Statewide total. The counties add up exactly to the statewide figure of 2,977,220 in the same file.

Using population numbers in a land search

• Big counties, busy offices. In the most populous counties, parcel maps and deed records are usually online and searchable, but recording and permit offices are busier. Allow for that if you are on a deadline.
• Small counties, fewer sales. In counties with only a few thousand people, land changes hands less often, so there are fewer recent sales to compare a price with. Recorded deeds and the local assessor's sales records are the best source.
• Density hints at lot size. A low people-per-square-mile figure usually means farms, ranches and timber tracts; a high one means subdivided lots. The parcel viewer shows the actual parcel lines.
• Check the official map. Use the parcel viewer link in the table for boundaries, parcel numbers and owner names, then confirm anything important with the local assessor and the office that records deeds.

Related guides

• Fastest growing counties in Kansas
• Largest counties in Kansas
• Kansas county GIS websites by viewer
• Kansas landowner maps for hunting
• Most populous counties in the US
• Where people are moving in the US

More: All Kansas counties on Platbookmapper

Sources

• U.S. Census Bureau, Population Estimates Program, county totals, Vintage 2025 (April 1, 2020 estimates base and July 1, 2020–2025 estimates, with components of change). Statewide totals are the sum of the counties and match the file's state row.
• U.S. Census Bureau Gazetteer files, 2020 county land and water area (for people per square mile).
• Platbookmapper county GIS directory (live data file behind our county pages, pulled October 25, 2026) for each official parcel viewer.