Montana county populations
56 supported county-equivalent records in Montana; July 1, 2025 population, 2024–2025 growth and 2025 land-area density.
Population totals use July 1, 2025 observations from PEP Vintage 2025. Change is measured since July 1, 2024. County equivalents are included, including Connecticut planning regions. Missing density is displayed as unavailable, never as zero.
Population table and filters
Whole-dataset downloads| Place | Population · 2025 | Change · 2024–25 | Growth · 2024–25 | People / sq. mi. |
|---|---|---|---|---|
| Yellowstone CountyMontana · County equivalent · 30111 | 172,692 | +1,144 | +0.67% | 65.6 |
| Gallatin CountyMontana · County equivalent · 30031 | 128,740 | +1,242 | +0.97% | 49.4 |
| Missoula CountyMontana · County equivalent · 30063 | 123,513 | +1,042 | +0.85% | 47.6 |
| Flathead CountyMontana · County equivalent · 30029 | 115,429 | +1,062 | +0.93% | 22.7 |
| Cascade CountyMontana · County equivalent · 30013 | 85,029 | +361 | +0.43% | 31.5 |
| Lewis and Clark CountyMontana · County equivalent · 30049 | 75,331 | +239 | +0.32% | 21.8 |
| Ravalli CountyMontana · County equivalent · 30081 | 48,582 | +545 | +1.13% | 20.3 |
| Silver Bow CountyMontana · County equivalent · 30093 | 36,118 | +27 | +0.07% | 50.3 |
| Lake CountyMontana · County equivalent · 30047 | 33,392 | +9 | +0.03% | 22.4 |
| Lincoln CountyMontana · County equivalent · 30053 | 22,328 | +181 | +0.82% | 6.2 |
| Park CountyMontana · County equivalent · 30067 | 18,214 | +41 | +0.23% | 6.5 |
| Hill CountyMontana · County equivalent · 30041 | 16,167 | +52 | +0.32% | 5.6 |
| Sanders CountyMontana · County equivalent · 30089 | 14,062 | +170 | +1.22% | 5.1 |
| Glacier CountyMontana · County equivalent · 30035 | 13,463 | -52 | -0.38% | 4.5 |
| Jefferson CountyMontana · County equivalent · 30043 | 13,329 | +98 | +0.74% | 8.0 |
| Big Horn CountyMontana · County equivalent · 30003 | 12,752 | -95 | -0.74% | 2.6 |
| Custer CountyMontana · County equivalent · 30017 | 12,034 | +57 | +0.48% | 3.2 |
| Fergus CountyMontana · County equivalent · 30027 | 11,825 | -1 | -0.01% | 2.7 |
| Carbon CountyMontana · County equivalent · 30009 | 11,466 | -38 | -0.33% | 5.6 |
| Richland CountyMontana · County equivalent · 30083 | 11,377 | +306 | +2.76% | 5.5 |
| Roosevelt CountyMontana · County equivalent · 30085 | 10,242 | +32 | +0.31% | 4.3 |
| Beaverhead CountyMontana · County equivalent · 30001 | 10,043 | +53 | +0.53% | 1.8 |
| Madison CountyMontana · County equivalent · 30057 | 10,026 | +254 | +2.60% | 2.8 |
| Deer Lodge CountyMontana · County equivalent · 30023 | 9,709 | -57 | -0.58% | 13.2 |
| Stillwater CountyMontana · County equivalent · 30095 | 9,445 | +16 | +0.17% | 5.3 |
| Dawson CountyMontana · County equivalent · 30021 | 8,692 | -47 | -0.54% | 3.7 |
| Broadwater CountyMontana · County equivalent · 30007 | 8,493 | +204 | +2.46% | 7.1 |
| Rosebud CountyMontana · County equivalent · 30087 | 8,253 | +35 | +0.43% | 1.6 |
| Valley CountyMontana · County equivalent · 30105 | 7,385 | 0 | 0.00% | 1.5 |
| Powell CountyMontana · County equivalent · 30077 | 7,157 | +36 | +0.51% | 3.1 |
| Blaine CountyMontana · County equivalent · 30005 | 6,860 | -16 | -0.23% | 1.6 |
| Teton CountyMontana · County equivalent · 30099 | 6,496 | +57 | +0.89% | 2.9 |
| Pondera CountyMontana · County equivalent · 30073 | 6,072 | +7 | +0.12% | 3.7 |
| Chouteau CountyMontana · County equivalent · 30015 | 5,865 | +12 | +0.21% | 1.5 |
| Musselshell CountyMontana · County equivalent · 30065 | 5,582 | +130 | +2.38% | 3.0 |
| Toole CountyMontana · County equivalent · 30101 | 5,211 | +58 | +1.13% | 2.7 |
| Mineral CountyMontana · County equivalent · 30061 | 5,185 | -2 | -0.04% | 4.3 |
| Phillips CountyMontana · County equivalent · 30071 | 4,203 | +7 | +0.17% | 0.8 |
| Sweet Grass CountyMontana · County equivalent · 30097 | 3,762 | -56 | -1.47% | 2.0 |
| Granite CountyMontana · County equivalent · 30039 | 3,658 | +19 | +0.52% | 2.1 |
| Sheridan CountyMontana · County equivalent · 30091 | 3,436 | -42 | -1.21% | 2.0 |
| Fallon CountyMontana · County equivalent · 30025 | 2,959 | -1 | -0.03% | 1.8 |
| Judith Basin CountyMontana · County equivalent · 30045 | 2,162 | +47 | +2.22% | 1.2 |
| Meagher CountyMontana · County equivalent · 30059 | 2,137 | +42 | +2.00% | 0.9 |
| Wheatland CountyMontana · County equivalent · 30107 | 2,100 | +42 | +2.04% | 1.5 |
| Liberty CountyMontana · County equivalent · 30051 | 1,957 | +6 | +0.31% | 1.4 |
| Powder River CountyMontana · County equivalent · 30075 | 1,781 | +23 | +1.31% | 0.5 |
| McCone CountyMontana · County equivalent · 30055 | 1,720 | +5 | +0.29% | 0.7 |
| Daniels CountyMontana · County equivalent · 30019 | 1,612 | -31 | -1.89% | 1.1 |
| Carter CountyMontana · County equivalent · 30011 | 1,383 | -39 | -2.74% | 0.4 |
Use these comparisons consistently
A larger population does not necessarily mean faster growth. Absolute change measures the number of residents gained or lost; percentage change divides that difference by the starting population. The percentage column here covers one July-to-July interval, rather than a decade or a partial calendar year. Percent growth is suppressed where the starting population is zero.
Density divides the unrounded July 1, 2025 population by matching 2025 Gazetteer land area. It is measured in people per square mile and excludes water area. These geographic averages depend on the size and definition of each unit, so a county’s density is not directly comparable to a built-up city neighborhood.
County-equivalent names and units vary by state. Connecticut planning regions are represented in the current series; linking older county series requires a documented relationship. Incorporated places may cross county boundaries and do not form an exhaustive county breakdown.
Exports contain the current page’s visible rows after filtering, with reference date and release metadata. Use whole-dataset downloads for every row or select a compatible comparison to inspect a longer interval. The initial pep-2025-r1 snapshot remains reproducible when future releases are added.