County facts · Population growth · October 23, 2026
Fastest Growing Counties in Indiana, 2020 to 2025
Indiana's fastest growing counties by percent and by people added, April 2020 to July 2025 Census estimates, with each official parcel map.
Looking for the fastest growing counties in Indiana? From the Census Bureau's April 1, 2020 estimates base to its July 1, 2025 estimate, Indiana went from about 6,786,605 to 6,973,333 residents, a change of +186,728 (+2.8%). The fastest growing county by percentage was Boone County (+14.0%), while Hamilton County added the most people (+39,546, +11.4%).
Each table links the county's Platbookmapper page and its official parcel viewer, so you can go from the growth numbers straight to the property lines.
Indiana growth at a glance
- County: 92
- Statewide, April 2020 to July 2025: +186,728 residents (+2.8%); July 2024 to July 2025 alone: +38,579 (+0.6%)
- Grew: 72 of 92 · Lost residents: 20
- Fastest growing by percent: Boone County (+14.0%); most people added: Hamilton County (+39,546)
- Counties with more deaths than births over the period: 65 of 92
The 10 fastest growing Indiana counties by percent
| # | County | Apr 2020 | Jul 2025 | Change | % change | Parcel viewer |
|---|---|---|---|---|---|---|
| 1 | Boone County | 70,786 | 80,689 | +9,903 | +14.0% | ArcGIS Experience Builder |
| 2 | Hancock County | 79,828 | 90,969 | +11,141 | +14.0% | Beacon (Schneider Geospatial) |
| 3 | Hamilton County | 347,490 | 387,036 | +39,546 | +11.4% | ArcGIS Experience Builder |
| 4 | Hendricks County | 174,815 | 193,510 | +18,695 | +10.7% | Beacon (Schneider Geospatial) |
| 5 | Johnson County | 161,776 | 174,262 | +12,486 | +7.7% | Beacon (Schneider Geospatial) |
| 6 | Clark County | 121,110 | 130,451 | +9,341 | +7.7% | Beacon (Schneider Geospatial) |
| 7 | Warrick County | 63,894 | 66,803 | +2,909 | +4.6% | WTH GIS |
| 8 | Morgan County | 71,776 | 74,967 | +3,191 | +4.4% | Beacon (Schneider Geospatial) |
| 9 | Allen County | 385,417 | 402,329 | +16,912 | +4.4% | county web map |
| 10 | Bartholomew County | 82,210 | 85,729 | +3,519 | +4.3% | Beacon (Schneider Geospatial) |
These 10 added about 127,643 people combined. The median county changed by +1.2%.
The 10 counties that added the most people
| # | County | People added | % change | Jul 2025 | Parcel viewer |
|---|---|---|---|---|---|
| 1 | Hamilton County | +39,546 | +11.4% | 387,036 | ArcGIS Experience Builder |
| 2 | Hendricks County | +18,695 | +10.7% | 193,510 | Beacon (Schneider Geospatial) |
| 3 | Allen County | +16,912 | +4.4% | 402,329 | county web map |
| 4 | Marion County | +14,994 | +1.5% | 992,196 | county web map |
| 5 | Johnson County | +12,486 | +7.7% | 174,262 | Beacon (Schneider Geospatial) |
| 6 | Hancock County | +11,141 | +14.0% | 90,969 | Beacon (Schneider Geospatial) |
| 7 | Boone County | +9,903 | +14.0% | 80,689 | ArcGIS Experience Builder |
| 8 | Clark County | +9,341 | +7.7% | 130,451 | Beacon (Schneider Geospatial) |
| 9 | Lake County | +5,917 | +1.2% | 504,612 | ArcGIS Experience Builder |
| 10 | Madison County | +4,989 | +3.8% | 135,088 | Beacon (Schneider Geospatial) |
The top 10 account for about 75% of all the gains in the counties that grew.
Where the new residents came from
The Census Bureau splits each change into natural change (births minus deaths), net domestic migration (moves from other parts of the US) and net international migration. Totals for April 2020 to July 2025 in the five fastest growing counties:
| County | Births minus deaths | Net domestic moves | Net international moves | Total change |
|---|---|---|---|---|
| Boone County | +995 | +8,435 | +504 | +9,903 |
| Hancock County | +225 | +10,480 | +406 | +11,141 |
| Hamilton County | +8,044 | +22,295 | +9,299 | +39,546 |
| Hendricks County | +2,107 | +14,011 | +2,748 | +18,695 |
| Johnson County | +1,387 | +8,864 | +2,315 | +12,486 |
In all 5, moves from elsewhere in the US were the biggest source of growth. The three parts do not add up exactly to the total because the Census Bureau also carries a small residual.
The last year alone: July 2024 to July 2025
- Boone County: +2.6% (+2,049)
- Hancock County: +2.4% (+2,092)
- Clark County: +2.1% (+2,688)
- Hamilton County: +1.9% (+7,351)
- Johnson County: +1.9% (+3,239)
5 of these 5 are also in the 2020–2025 top 10, so the growth is not a one-year blip.
Counties losing residents
20 of Indiana's 92 counties had fewer residents in July 2025 than in April 2020. The steepest declines:
- Miami County: −4.1% (−1,473, now about 34,487)
- Union County: −3.2% (−227, now about 6,863)
- Blackford County: −3.1% (−380, now about 11,730)
- Pike County: −2.0% (−248, now about 12,003)
- Fulton County: −1.9% (−393, now about 20,091)
What fast growth means on a parcel map
- New lots show up as plats first. When land is subdivided, the plat is recorded with the county and the parcel layer catches up on its own schedule, so a brand-new lot may not appear on the map for a while. Check the recorder's recent plats if a parcel looks missing.
- Parcel numbers change after splits. A tract that was one parcel last year can be several today. Search by owner name or address as well as by an old parcel number.
- City limits move. Growing cities annex land, which changes who handles zoning and permits even though the county still keeps the deed and the tax map.
- Percent is not the same as people. A small county can post a big percentage on a modest number of new residents, so read the people-added column too.
Related guides
- Largest counties in Indiana
- Indiana county GIS websites by viewer
- Indiana landowner maps for hunting
- Fastest growing counties in the US
- US counties losing population
More: All Indiana 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). Percent change is from the April 1, 2020 estimates base to the July 1, 2025 estimate.
- Platbookmapper county GIS directory (live data file behind our county pages, pulled October 23, 2026) for each official parcel viewer.