| ZIP Codes: | 10 ZIP Codes (10 Standard, 0 PO Box, 0 Unique) [See All] |
| Area Code: | 406 |
| Timezone: | Mountain (GMT -07:00) |
| Local Time: | 2:12:52 PM |
| Population: | 11,825 [See All] |
| FIPS: | 30027 |
| Land Area: | 4,671 sq mi |
| Water Area: | 11 sq mi |
| Coordinates: | 47.1898, -109.3903 |
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11,825 residents live across 10 ZIPs covering 4,671 sq mi, served by 10 distinct USPS-recognized cities.
Population moved from 11,602 to 11,825 from 2014 to 2024 — a +1.9% change. 7 ZIPs gained residents, 3 lost.
The county's wealthiest ZIP 59451 (Hilger, $85,625 median) and poorest ZIP 59032 (Grass Range, $42,000) are 41.1 miles apart — a 2.0× income gap across local geography.
Median home values vary 2.0× across this county — from $150,000 in 59032 (Grass Range) to $294,100 in 59424 (Coffee Creek).
Density varies 31× across the county — from 0 people/sq mi in 59471 (Roy) to 10 in 59457 (Lewistown).
Educational attainment ranges from 15.1% bachelor's+ in 59032 (Grass Range) to 62.3% in 59424 (Coffee Creek) — the breadth of educational profiles across the area.
Within Montana, this is the #18 most populous of 56 counties and ranks #28 for median household income .
Weighted by population, the typical household earns about $64,361 across the county — reflecting what a typical resident sees, not a simple ZIP average.
23.8% of adults age 25+ hold a bachelor's degree or higher (2,051 of 8,618 reporting).
10 Standard delivery, 0 PO Box only, 0 single-entity Unique ZIPs serve this county.
A frontier county — vast land area with only a few residents per square mile. Daily life looks very different here than in the country's denser counties.
One ZIP holds the majority of this county's population — a sign of a county built around a single city or town.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 59457 | Lewistown | Standard | 9,135 | $64,762 | 921.0 | -1.6% |
| 59464 | Moore | Standard | 597 | $56,979 | 280.6 | 34.8% |
| 59430 | Denton | Standard | 448 | $76,875 | 525.5 | 13.7% |
| 59489 | Winifred | Standard | 424 | $64,637 | 736.1 | 38.6% |
| 59032 | Grass Range | Standard | 409 | $42,000 | 532.9 | 13.0% |
| 59471 | Roy | Standard | 318 | $65,156 | 978.4 | 19.1% |
| 59418 | Buffalo | Standard | 142 | — | 131.7 | -20.2% |
| 59441 | Forest Grove | Standard | 126 | $62,344 | 225.0 | 110.0% |
| 59451 | Hilger | Standard | 123 | $85,625 | 274.6 | -47.2% |
| 59424 | Coffee Creek | Standard | 103 | $79,375 | 64.9 | 30.4% |