What are the fastest-growing counties in Indiana?
Boone County is the fastest-growing county in Indiana: its population grew 2.56% a year from 2020 to 2025, to 80,689 residents (Census PEP Vintage 2025). Hancock County (2.56%) and Hamilton County (2.09%) follow. Indiana as a whole grew 0.53% a year to 6,973,333 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 Indiana by population growth, 2020 to 2025
| Rank | County | Population | Growth (% per year) | Net domestic migration | Net international migration | IRS net AGI migration |
|---|---|---|---|---|---|---|
| 1 | Boone County | 80,689 | 2.56% | +8,109 | +504 | +$106.5M |
| 2 | Hancock County | 90,969 | 2.56% | +10,116 | +405 | +$111.2M |
| 3 | Hamilton County | 387,036 | 2.09% | +21,101 | +9,266 | +$102.7M |
| 4 | Hendricks County | 193,510 | 1.96% | +13,210 | +2,741 | -$1.0M |
| 5 | Clark County | 130,451 | 1.45% | +8,328 | +1,044 | +$31.8M |
| 6 | Johnson County | 174,262 | 1.44% | +8,398 | +2,312 | +$36.7M |
| 7 | Morgan County | 74,967 | 0.86% | +3,410 | +298 | +$40.4M |
| 8 | Warrick County | 66,803 | 0.86% | +2,757 | +312 | +$13.9M |
| 9 | Bartholomew County | 85,729 | 0.84% | -701 | +3,428 | -$36.5M |
| 10 | Allen County | 402,329 | 0.83% | +3,162 | +6,276 | -$78.8M |
Where are people moving in Indiana?
Hamilton County gained the most people from elsewhere in the United States: net domestic migration of +21,101 from 2020 to 2025 (Census PEP Vintage 2025). The table ranks every Indiana 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 | Hamilton County | 387,036 | 2.09% | +21,101 | +9,266 | +$102.7M |
| 2 | Hendricks County | 193,510 | 1.96% | +13,210 | +2,741 | -$1.0M |
| 3 | Hancock County | 90,969 | 2.56% | +10,116 | +405 | +$111.2M |
| 4 | Johnson County | 174,262 | 1.44% | +8,398 | +2,312 | +$36.7M |
| 5 | Clark County | 130,451 | 1.45% | +8,328 | +1,044 | +$31.8M |
| 6 | Boone County | 80,689 | 2.56% | +8,109 | +504 | +$106.5M |
| 7 | Madison County | 135,088 | 0.75% | +6,453 | +483 | +$30.7M |
| 8 | Lake County | 504,612 | 0.23% | +3,839 | +3,499 | -$5.7M |
| 9 | Porter County | 176,049 | 0.31% | +3,416 | +744 | +$27.0M |
| 10 | Morgan County | 74,967 | 0.86% | +3,410 | +298 | +$40.4M |
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 Boone CountyFrequently asked questions
- What are the fastest-growing counties in Indiana?
- By population growth from 2020 to 2025, the fastest are Boone County (2.56% a year), Hancock County (2.56% a year), Hamilton County (2.09% a year), Hendricks County (1.96% a year) and Clark County (1.45% a year) (Census PEP Vintage 2025). Only places with 10,000 or more residents are ranked.
- Where are people moving in Indiana?
- By net domestic migration from 2020 to 2025, the largest gains are Hamilton County (+21,101), Hendricks County (+13,210) and Hancock County (+10,116) (Census PEP Vintage 2025).
- How fast is Indiana growing overall?
- Indiana grew 0.53% a year from 2020 to 2025, to 6,973,333 residents, with net migration of +157,914 people (Census PEP Vintage 2025).
- Where does this Indiana 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 (5 of 92 in Indiana). 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.