Indiana County Maps
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Indiana has 92 counties, a population of more than 7 million people, about 807 zip codes and 333 public school districts. Those counties vary widely in population, school enrollment, zip code coverage and local boundary structure. Marion County has the largest population in the state, while Ohio County has the smallest. Browse the map, population, zip codes, school districts, subdivisions and county list sections below to explore further. Or, simply start typing in the box below to go directly to that county.
Interactive Indiana County Map
This Indiana county map preview highlights population-by-county context, ZIP code coverage, school districts, and local boundary structure. Full statewide and county-level data packages are available when you need complete downloadable datasets. Click or tap any county to view its maps, trends and data.
Start with a free preview, or go straight to the full Indiana dataset .
Indiana Population By County
Indiana's population was over 7 million in 2020, up 302,242 (4.66%) residents from 2010. Marion County had the largest population in the state with 977,203 people. Lake and Allen Counties also stand out as major population centers. Ohio County was the least populated area in Indiana with only 5,940 residents. The table below compares Indiana county populations and recent population trends.
The Most Populated Counties In Indiana
| County | Population | Trend (2010-2020) |
|---|---|---|
| Marion County | 977,203 | ▴ 8.17% |
| Lake County | 498,700 | ▴ 0.54% |
| Allen County | 385,410 | ▴ 8.47% |
| Hamilton County | 347,467 | ▴ 26.55% |
| St. Joseph County | 272,912 | ▴ 2.24% |
| Download all county population data | ||
County populations reflect the latest state serving context (2020).
Indiana County Map With ZIP Codes
Indiana has about 807 zip codes statewide. Marion County contains the most zip codes, with 37. County-level zip code maps give a faster and clearer way to understand local coverage as zip boundaries can span county and municipal lines. The maps below highlight a few Indiana counties.
Indiana School Districts By County
Indiana has 333 public school districts with 1,050,955 students enrolled as of 2024. Lake County has the highest district count in the state. Marion County has the largest total school enrollment. Clark County posted the largest recent enrollment gain. The table below compares county level school district totals and recent enrollment trends across the state.
Largest School Districts in Indiana
| County | Districts | Enrollment | Trend |
|---|---|---|---|
| Lake County | 16 | 66,147 | ▾ 1.70% |
| Marion County | 11 | 126,220 | ▴ 0.67% |
| Porter County | 8 | 29,772 | ▾ 0.80% |
| Elkhart County | 7 | 32,823 | ▾ 1.62% |
| Johnson County | 7 | 28,824 | ▴ 1.37% |
| Download all school district data | |||
School district enrollment and trend values reflect the most recent state-level context (2024).
Indiana County Map With Subdivisions
Indiana has about 1,012 local subdivisions statewide. These boundaries add another layer of detail within counties and help show how local subdivision lines fit inside county boundaries. The previews below highlight a few Indiana counties with subdivision map coverage.
Get the Full Indiana Data Package
The sections above provide a preview of Indiana county maps and county-level data. The full package includes complete statewide coverage with ready-to-use files for mapping, planning, and analysis.
Everything is organized to save hours of data collection, cleanup, and integration work.
- County map exports and boundary coverage for every county in Indiana
- Statewide GIS layers for ZIP codes, subdivisions, school districts, roads, water, and political boundaries
- Population, demographics, school, housing, and trend context aligned across counties
- Database files, map-ready exports, and documentation designed for faster research workflows
Includes GIS layers, maps, demographics, analytics, database files and planning tools.