What are the fastest-growing counties in Kansas?
Pottawatomie County is the fastest-growing county in Kansas: its population grew 1.35% a year from 2020 to 2025, to 27,186 residents (Census PEP Vintage 2025). Miami County (1.15%) and Johnson County (0.83%) follow. Kansas as a whole grew 0.26% a year to 2,977,220 residents.
Data as of 2026-09-23. Population, growth and migration: PEP Vintage 2025 · 2020–2025. Income migration: IRS SOI 2022–2023 (2-yr lag).
Top 10 counties in Kansas by population growth, 2020 to 2025
| Rank | County | Population | Growth (% per year) | Net domestic migration | Net international migration | IRS net AGI migration |
|---|---|---|---|---|---|---|
| 1 | Pottawatomie County | 27,186 | 1.35% | +685 | +199 | +$10.2M |
| 2 | Miami County | 36,240 | 1.15% | +1,937 | +21 | +$27.7M |
| 3 | Johnson County | 636,906 | 0.83% | +2,057 | +13,020 | -$124.8M |
| 4 | Leavenworth County | 84,590 | 0.63% | +1,370 | +552 | +$10.0M |
| 5 | Butler County | 69,484 | 0.61% | +1,647 | +754 | +$18.7M |
| 6 | Sedgwick County | 538,433 | 0.51% | +607 | +7,296 | -$35.7M |
| 7 | Douglas County | 120,920 | 0.36% | -1,048 | +2,578 | -$31.4M |
| 8 | Jackson County | 13,438 | 0.30% | +84 | +109 | +$1.9M |
| 9 | Dickinson County | 18,637 | 0.27% | +712 | -6 | +$1.6M |
| 10 | Franklin County | 26,299 | 0.22% | +307 | +136 | +$11.2M |
Where are people moving in Kansas?
Johnson County gained the most people from elsewhere in the United States: net domestic migration of +2,057 from 2020 to 2025 (Census PEP Vintage 2025). The table ranks every Kansas place with 10,000 or more residents by that figure; the IRS column shows net adjusted gross income migration for 2022 to 2023.
| Rank | County | Population | Growth (% per year) | Net domestic migration | Net international migration | IRS net AGI migration |
|---|---|---|---|---|---|---|
| 1 | Johnson County | 636,906 | 0.83% | +2,057 | +13,020 | -$124.8M |
| 2 | Miami County | 36,240 | 1.15% | +1,937 | +21 | +$27.7M |
| 3 | Butler County | 69,484 | 0.61% | +1,647 | +754 | +$18.7M |
| 4 | Leavenworth County | 84,590 | 0.63% | +1,370 | +552 | +$10.0M |
| 5 | Dickinson County | 18,637 | 0.27% | +712 | -6 | +$1.6M |
| 6 | Pottawatomie County | 27,186 | 1.35% | +685 | +199 | +$10.2M |
| 7 | Sedgwick County | 538,433 | 0.51% | +607 | +7,296 | -$35.7M |
| 8 | Reno County | 61,539 | -0.11% | +495 | +190 | +$4.9M |
| 9 | Cherokee County | 19,105 | -0.21% | +422 | -12 | -$2.8M |
| 10 | Osage County | 15,693 | -0.07% | +322 | +2 | +$3.2M |
Go past the headline numbers
The interactive Demographics map layer and the full report for a single place are part of paid plans.
Get the Demographics Report for Pottawatomie CountyFrequently asked questions
- What are the fastest-growing counties in Kansas?
- By population growth from 2020 to 2025, the fastest are Pottawatomie County (1.35% a year), Miami County (1.15% a year), Johnson County (0.83% a year), Leavenworth County (0.63% a year) and Butler County (0.61% a year) (Census PEP Vintage 2025). Only places with 10,000 or more residents are ranked.
- Where are people moving in Kansas?
- By net domestic migration from 2020 to 2025, the largest gains are Johnson County (+2,057), Miami County (+1,937) and Butler County (+1,647) (Census PEP Vintage 2025).
- How fast is Kansas growing overall?
- Kansas grew 0.26% a year from 2020 to 2025, to 2,977,220 residents, with net migration of +21,768 people (Census PEP Vintage 2025).
- Where does this Kansas data come from, and how current is it?
- Population, growth and migration come from the U.S. Census Bureau Population Estimates Program (PEP Vintage 2025 · 2020–2025). Income migration comes from IRS Statistics of Income (IRS SOI 2022–2023 (2-yr lag)). Counties with fewer than 10,000 residents are not ranked (67 of 105 in Kansas). Data last loaded 2026-09-23.
Data as of 2026-09-23: sources and periods
- Population, growth and migration
- U.S. Census Bureau, Population Estimates Program: PEP Vintage 2025 · 2020–2025. census.gov/programs-surveys/popest
- Income migration (net AGI)
- Internal Revenue Service, Statistics of Income migration data: IRS SOI 2022–2023 (2-yr lag). irs.gov/statistics/soi-tax-stats-migration-data
How to read the table
- Population is the Census July 1 estimate of the latest vintage.
- Growth is the compound annual rate over 2020 to 2025.
- Net domestic and international migration are cumulative people over 2020 to 2025.
- IRS net AGI migration is adjusted gross income that moved in, less what moved out, for 2022 to 2023. A plus sign means a net inflow.
- Places with fewer than 10,000 residents are left out of the rankings.