County facts · Land area · October 21, 2026
Largest Counties in Indiana by Area and Population
The largest Indiana counties by land area and by 2023 population, plus the smallest, county seats and a link to each official parcel map.
Looking for the largest counties in Indiana? Indiana has 92 counties covering about 35,826 square miles of land, based on the Census Bureau's 2020 Gazetteer. The largest by land area is Allen County, at about 657 square miles, roughly 7.6 times the size of the smallest, Ohio County (86 sq mi). Measured by people instead, the largest is Marion County, with about 968,460 residents in the Census Bureau's July 1, 2023 estimate.
Each table below links the county's Platbookmapper page and its official parcel viewer, so you can go straight from the numbers to the property lines.
Indiana counties at a glance
- Counties: 92
- Land area: about 35,826 sq mi, plus about 595 sq mi of water inside county lines
- Residents, 2023 estimates: about 6,862,199, or about 192 people per square mile of land
- Median county land area: about 397 sq mi
- With a verified public parcel viewer in our directory: 92 of 92
The 10 largest Indiana counties by land area
| # | County | Seat | Land (sq mi) | 2023 pop. | People per sq mi | Parcel viewer |
|---|---|---|---|---|---|---|
| 1 | Allen County | Fort Wayne | 657 | 394,545 | 600 | county web map |
| 2 | LaPorte County | La Porte | 598 | 111,706 | 187 | Beacon (Schneider Geospatial) |
| 3 | Jasper County | Rensselaer | 560 | 33,535 | 60 | Beacon (Schneider Geospatial) |
| 4 | Greene County | Bloomfield | 542 | 31,196 | 58 | WTH GIS |
| 5 | Kosciusko County | Warsaw | 531 | 80,364 | 151 | Beacon (Schneider Geospatial) |
| 6 | Knox County | Vincennes | 516 | 36,070 | 70 | Beacon (Schneider Geospatial) |
| 7 | Washington County | Salem | 514 | 28,205 | 55 | WTH GIS |
| 8 | Jackson County | Brownstown | 510 | 46,460 | 91 | WTH GIS |
| 9 | White County | Monticello | 505 | 24,917 | 49 | Beacon (Schneider Geospatial) |
| 10 | Montgomery County | Crawfordsville | 505 | 38,573 | 76 | Beacon (Schneider Geospatial) |
Together these 10 cover about 15% of Indiana's land area and hold about 12% of its residents.
The 10 most populous Indiana counties
| # | County | Seat | 2023 pop. | Land (sq mi) | Parcel viewer |
|---|---|---|---|---|---|
| 1 | Marion County | Indianapolis | 968,460 | 397 | county web map |
| 2 | Lake County | Crown Point | 500,598 | 499 | ArcGIS Experience Builder |
| 3 | Allen County | Fort Wayne | 394,545 | 657 | county web map |
| 4 | Hamilton County | Noblesville | 371,645 | 394 | ArcGIS Experience Builder |
| 5 | St. Joseph County | South Bend | 272,848 | 458 | ArcGIS Web AppBuilder |
| 6 | Elkhart County | Goshen | 206,409 | 463 | Beacon (Schneider Geospatial) |
| 7 | Tippecanoe County | Lafayette | 188,792 | 499 | Beacon (Schneider Geospatial) |
| 8 | Hendricks County | Danville | 186,387 | 407 | Beacon (Schneider Geospatial) |
| 9 | Vanderburgh County | Evansville | 179,810 | 233 | Beacon (Schneider Geospatial) |
| 10 | Porter County | Valparaiso | 175,335 | 418 | ArcGIS Experience Builder |
These 10 hold about 50% of Indiana's residents in the 2023 estimates.
The 5 smallest Indiana counties by land area
| County | Seat | Land (sq mi) | 2023 pop. | Parcel viewer |
|---|---|---|---|---|
| Ohio County | Rising Sun | 86 | 6,004 | WTH GIS |
| Floyd County | New Albany | 148 | 80,809 | Beacon (Schneider Geospatial) |
| Union County | Liberty | 161 | 6,973 | WTH GIS |
| Blackford County | Hartford City | 165 | 11,893 | Beacon (Schneider Geospatial) |
| Scott County | Scottsburg | 190 | 24,657 | WTH GIS |
Most and least crowded
- Most people per square mile: Marion County, about 2,442 (then Lake County, 1,004, and Hamilton County, 942)
- Fewest people per square mile: Benton County, about 21 (then Warren County, 23, and Pulaski County, 29)
Counties with the most water
The Census Bureau reports water separately from land. It counts lakes, reservoirs, rivers and, for coastal and Great Lakes counties, the water inside the county boundary.
- Lake County: about 128 sq mi of water, 20% of its total area
- Porter County: about 104 sq mi of water, 20% of its total area
- Kosciusko County: about 23 sq mi of water, 4% of its total area
Using these numbers in a land search
- Land area is not parcel count. A large rural county can hold fewer parcels than a small suburban one, so size alone says little about how busy its parcel map is.
- Search, don't scroll. In a big county, type an address, owner name or parcel number into the viewer's search box, where it has one, instead of panning across the map.
- Records follow the county line. Deeds, plats and tax bills are kept by the county where the parcel sits, so a tract that crosses a county line usually has a parcel number in each county.
- Rounded figures. Land and water areas are rounded to whole square miles. People per square mile is the 2023 estimate divided by land area.
Related guides
- Indiana county GIS websites by viewer
- Indiana landowner maps for hunting
- Illinois–Indiana border counties
- Indiana–Kentucky border counties
- Indiana–Michigan border counties
- Indiana–Ohio border counties
More: All Indiana counties on Platbookmapper
Sources
- U.S. Census Bureau Gazetteer files, 2020 county land and water area.
- U.S. Census Bureau, Population Estimates Program, county totals, Vintage 2023 (July 1, 2023 estimates)
- Platbookmapper county GIS directory (live data file behind our county pages, pulled October 21, 2026) for each county's official parcel viewer.
- County seats: Wikidata (county seat property), cross-checked against Census place names.