What are the fastest-growing counties and St. Louis city in Missouri?
Lincoln County is the fastest-growing county in Missouri: its population grew 2.19% a year from 2020 to 2025, to 66,676 residents (Census PEP Vintage 2025). Webster County (1.99%) and Warren County (1.77%) follow. Missouri as a whole grew 0.37% a year to 6,270,541 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 and St. Louis city in Missouri by population growth, 2020 to 2025
| Rank | County or city | Population | Growth (% per year) | Net domestic migration | Net international migration | IRS net AGI migration |
|---|---|---|---|---|---|---|
| 1 | Lincoln County | 66,676 | 2.19% | +5,850 | +158 | +$32.3M |
| 2 | Webster County | 43,054 | 1.99% | +3,156 | +9 | +$11.9M |
| 3 | Warren County | 39,016 | 1.77% | +3,160 | +37 | +$14.2M |
| 4 | Christian County | 96,725 | 1.61% | +6,329 | +423 | +$19.5M |
| 5 | Wright County | 19,671 | 1.56% | +1,563 | +4 | +$4.9M |
| 6 | Cass County | 115,859 | 1.38% | +7,574 | +113 | +$72.0M |
| 7 | Texas County | 25,994 | 1.34% | +2,240 | -12 | +$11.5M |
| 8 | Morgan County | 22,418 | 1.32% | +1,750 | -13 | +$12.4M |
| 9 | Platte County | 114,400 | 1.31% | +4,221 | +1,731 | -$14.9M |
| 10 | Douglas County | 12,342 | 1.24% | +1,066 | +29 | +$2.1M |
Where are people moving in Missouri?
St. Charles County gained the most people from elsewhere in the United States: net domestic migration of +12,767 from 2020 to 2025 (Census PEP Vintage 2025). The table ranks every Missouri 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 or city | Population | Growth (% per year) | Net domestic migration | Net international migration | IRS net AGI migration |
|---|---|---|---|---|---|---|
| 1 | St. Charles County | 426,499 | 0.97% | +12,767 | +5,230 | +$70.8M |
| 2 | Greene County | 309,286 | 0.66% | +8,202 | +2,754 | -$13.1M |
| 3 | Cass County | 115,859 | 1.38% | +7,574 | +113 | +$72.0M |
| 4 | Jefferson County | 233,132 | 0.54% | +6,374 | +249 | +$55.2M |
| 5 | Christian County | 96,725 | 1.61% | +6,329 | +423 | +$19.5M |
| 6 | Lincoln County | 66,676 | 2.19% | +5,850 | +158 | +$32.3M |
| 7 | Clay County | 265,032 | 0.84% | +4,810 | +2,594 | +$4.8M |
| 8 | Platte County | 114,400 | 1.31% | +4,221 | +1,731 | -$14.9M |
| 9 | Franklin County | 108,090 | 0.61% | +3,776 | +174 | +$38.2M |
| 10 | Warren County | 39,016 | 1.77% | +3,160 | +37 | +$14.2M |
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 Lincoln CountyFrequently asked questions
- What are the fastest-growing counties and St. Louis city in Missouri?
- By population growth from 2020 to 2025, the fastest are Lincoln County (2.19% a year), Webster County (1.99% a year), Warren County (1.77% a year), Christian County (1.61% a year) and Wright County (1.56% a year) (Census PEP Vintage 2025). Only places with 10,000 or more residents are ranked.
- Where are people moving in Missouri?
- By net domestic migration from 2020 to 2025, the largest gains are St. Charles County (+12,767), Greene County (+8,202) and Cass County (+7,574) (Census PEP Vintage 2025).
- How fast is Missouri growing overall?
- Missouri grew 0.37% a year from 2020 to 2025, to 6,270,541 residents, with net migration of +126,891 people (Census PEP Vintage 2025).
- Where does this Missouri 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 and St. Louis city with fewer than 10,000 residents are not ranked (31 of 115 in Missouri). 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.