Ohio County Maps
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Ohio has 88 counties, a population of more than 12 million people, about 1,233 zip codes and 880 public school districts. Those counties vary widely in population, school enrollment, zip code coverage and local boundary structure. Franklin County has the largest population in the state, while Vinton 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 Ohio County Map
This Ohio 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 Ohio dataset .
Ohio Population By County
Ohio's population was over 12 million in 2020, up 262,904 (2.28%) residents from 2010. Franklin County had the largest population in the state with more than 1 million people. Cuyahoga and Hamilton Counties also stand out as major population centers. Vinton County was the least populated area in Ohio with only 12,800 residents. The table below compares Ohio county populations and recent population trends.
The Most Populated Counties In Ohio
| County | Population | Trend (2010-2020) |
|---|---|---|
| Franklin County | 1,323,807 | ▴ 13.79% |
| Cuyahoga County | 1,264,817 | ▾ 1.20% |
| Hamilton County | 830,639 | ▴ 3.52% |
| Summit County | 540,428 | ▾ 0.25% |
| Montgomery County | 537,309 | ▴ 0.40% |
| Download all county population data | ||
County populations reflect the latest state serving context (2020).
Ohio County Map With ZIP Codes
Ohio has about 1,233 zip codes statewide. Hamilton County contains the most zip codes, with 54. 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 Ohio counties.
Ohio School Districts By County
Ohio has 880 public school districts with 2,003,930 students enrolled as of 2024. Cuyahoga County has the highest district count in the state. Franklin County has the largest total school enrollment. Franklin 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 Ohio
| County | Districts | Enrollment | Trend |
|---|---|---|---|
| Cuyahoga County | 31 | 127,751 | ▾ 1.70% |
| Hamilton County | 25 | 102,791 | ▾ 1.64% |
| Trumbull County | 22 | 24,909 | ▾ 1.78% |
| Montgomery County | 21 | 79,731 | ▾ 0.96% |
| Summit County | 21 | 78,816 | ▾ 1.46% |
| Download all school district data | |||
School district enrollment and trend values reflect the most recent state-level context (2024).
Ohio County Map With Subdivisions
Ohio has about 1,607 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 Ohio counties with subdivision map coverage.
Get the Full Ohio Data Package
The sections above provide a preview of Ohio 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 Ohio
- 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.