Montana County Maps
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Montana has 56 counties, a population of more than 1 million people, about 369 zip codes and 68 public school districts. Those counties vary widely in population, school enrollment, zip code coverage and local boundary structure. Yellowstone County has the largest population in the state, while Petroleum County has the smallest. Browse the map, population, zip codes, school districts, county subdivisions and county list sections below to explore further. Or, simply start typing in the box below to go directly to that county.
Interactive Montana County Map
This Montana 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 Montana dataset .
Montana Population By County
Montana's population was over 1 million in 2020, up 94,683 (9.57%) residents from 2010. Yellowstone County had the largest population in the state with 164,731 people. Gallatin and Missoula Counties also stand out as major population centers. Petroleum County was the least populated area in Montana with only 496 residents. The table below compares Montana county populations and recent population trends.
The Most Populated Counties In Montana
| County | Population | Trend (2010-2020) |
|---|---|---|
| Yellowstone County | 164,731 | ▴ 11.33% |
| Gallatin County | 118,960 | ▴ 32.90% |
| Missoula County | 117,922 | ▴ 7.76% |
| Flathead County | 104,357 | ▴ 14.77% |
| Cascade County | 84,414 | ▴ 3.80% |
| Download all county population data | ||
County populations reflect the latest state serving context (2020).
Montana County Map With ZIP Codes
Montana has about 369 zip codes statewide. Cascade County contains the most zip codes, with 15. 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 Montana counties.
Montana School Districts By County
Montana has 68 public school districts with 22,636 students enrolled as of 2024. Ravalli County stands out for both district count and total enrollment. Lewis and 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 Montana
| County | Districts | Enrollment | Trend |
|---|---|---|---|
| Ravalli County | 5 | 4,454 | ▴ 0.27% |
| Carbon County | 4 | 418 | ▾ 6.90% |
| Yellowstone County | 3 | 2,419 | ▾ 4.91% |
| Missoula County | 3 | 2,196 | ▾ 5.39% |
| Valley County | 3 | 909 | ▾ 0.98% |
| Download all school district data | |||
School district enrollment and trend values reflect the most recent state-level context (2024).
Montana County Map With County Subdivisions
Montana has about 194 county subdivisions statewide. These boundaries add another layer of local detail and help show how subdivision lines fit inside county boundaries. The previews below highlight a few counties with available subdivision map coverage.
Get the Full Montana Data Package
The sections above provide a preview of Montana 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 Montana
- 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.