What are the fastest-growing counties in Kentucky?
Warren County is the fastest-growing county in Kentucky: its population grew 2.04% a year from 2020 to 2025, to 149,375 residents (Census PEP Vintage 2025). Allen County (1.84%) and Madison County (1.80%) follow. Kentucky as a whole grew 0.43% a year to 4,606,864 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 Kentucky by population growth, 2020 to 2025
| Rank | County | Population | Growth (% per year) | Net domestic migration | Net international migration | IRS net AGI migration |
|---|---|---|---|---|---|---|
| 1 | Warren County | 149,375 | 2.04% | +6,588 | +5,017 | +$16.3M |
| 2 | Allen County | 22,536 | 1.84% | +1,862 | +37 | +$12.7M |
| 3 | Madison County | 101,696 | 1.80% | +7,391 | +698 | +$37.0M |
| 4 | Scott County | 62,262 | 1.59% | +3,234 | +430 | +$22.5M |
| 5 | Jessamine County | 57,147 | 1.50% | +2,257 | +1,470 | +$40.6M |
| 6 | Spencer County | 20,998 | 1.50% | +1,472 | +53 | +$9.0M |
| 7 | Garrard County | 18,207 | 1.42% | +1,499 | +137 | +$10.2M |
| 8 | Boone County | 145,316 | 1.26% | +3,024 | +2,814 | -$54.6M |
| 9 | Shelby County | 51,243 | 1.21% | +1,512 | +978 | +$32.9M |
| 10 | Simpson County | 20,788 | 1.15% | +1,175 | +93 | +$8.4M |
Where are people moving in Kentucky?
Madison County gained the most people from elsewhere in the United States: net domestic migration of +7,391 from 2020 to 2025 (Census PEP Vintage 2025). The table ranks every Kentucky 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 | Madison County | 101,696 | 1.80% | +7,391 | +698 | +$37.0M |
| 2 | Warren County | 149,375 | 2.04% | +6,588 | +5,017 | +$16.3M |
| 3 | Bullitt County | 86,454 | 0.97% | +3,887 | +593 | +$22.2M |
| 4 | Pulaski County | 67,384 | 0.69% | +3,275 | +381 | +$26.5M |
| 5 | Scott County | 62,262 | 1.59% | +3,234 | +430 | +$22.5M |
| 6 | Boone County | 145,316 | 1.26% | +3,024 | +2,814 | -$54.6M |
| 7 | Oldham County | 70,986 | 0.95% | +2,377 | +556 | +$12.0M |
| 8 | Jessamine County | 57,147 | 1.50% | +2,257 | +1,470 | +$40.6M |
| 9 | Calloway County | 39,421 | 0.95% | +1,948 | +462 | +$4.0M |
| 10 | Allen County | 22,536 | 1.84% | +1,862 | +37 | +$12.7M |
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 Warren CountyFrequently asked questions
- What are the fastest-growing counties in Kentucky?
- By population growth from 2020 to 2025, the fastest are Warren County (2.04% a year), Allen County (1.84% a year), Madison County (1.80% a year), Scott County (1.59% a year) and Jessamine County (1.50% a year) (Census PEP Vintage 2025). Only places with 10,000 or more residents are ranked.
- Where are people moving in Kentucky?
- By net domestic migration from 2020 to 2025, the largest gains are Madison County (+7,391), Warren County (+6,588) and Bullitt County (+3,887) (Census PEP Vintage 2025).
- How fast is Kentucky growing overall?
- Kentucky grew 0.43% a year from 2020 to 2025, to 4,606,864 residents, with net migration of +116,459 people (Census PEP Vintage 2025).
- Where does this Kentucky 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 (22 of 120 in Kentucky). 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.