Indiana Counties, Demographics & Geography
Complete official guide to all 92 counties in Indiana (IN). Explore 2024 US Census population estimates, county seats, FIPS codes, land areas, and interactive mapping tools powered by GeoMap Suite.
Indiana County Breakdown
Showing 8 of 8 documented counties and seats.
County Name | FIPS | County Seat | Population (Census) | Land Area | Quick Tool |
|---|---|---|---|---|---|
| Marion County | 18097 | Indianapolis | 977,203 | 396 sq mi | Lookup |
| Lake County | 18089 | Crown Point | 498,700 | 499 sq mi | Lookup |
| Allen County | 18003 | Fort Wayne | 385,410 | 657 sq mi | Lookup |
| Hamilton County | 18057 | Noblesville | 347,461 | 394 sq mi | Lookup |
| St. Joseph County | 18141 | South Bend | 272,912 | 457 sq mi | Lookup |
| Elkhart County | 18039 | Goshen | 207,047 | 463 sq mi | Lookup |
| Tippecanoe County | 18157 | Lafayette | 186,251 | 499 sq mi | Lookup |
| Vanderburgh County | 18163 | Evansville | 180,136 | 233 sq mi | Lookup |
Geographic Structure of Indiana Counties
County Administration & Governance
In Indiana, county governments manage vital public infrastructure, tax assessments, law enforcement, judicial courts, election administration, and public records. The county seat (Indianapolis and other municipal headquarters) houses the primary courthouse, commissioners, and sheriff’s department.
All Indiana counties carry a unique 5-digit Federal Information Processing Standard (FIPS) code, where the first two digits (18) designate the state and the remaining three digits identify each specific jurisdiction.
Geographic & Demographic Highlights
- Most Populous County:Marion County (977,203 residents)
- Largest by Land Area:Allen County (657 sq mi)
- State Capital:Indianapolis
- Census Bureau Region:Midwest United States
Demographic calculations derive from the United States Census Bureau 2024 Population Estimates Program (PEP) and TIGER/Line geographic boundary files.