| ZIP Codes: | 7 ZIP Codes (4 Standard, 3 PO Box, 0 Unique) [See All] |
| Area Code: | 406 |
| Timezone: | Mountain (GMT -07:00) |
| Local Time: | 11:54:12 PM |
| Population: | 21,175 [See All] |
| FIPS: | 30053 |
| Land Area: | 3,587 sq mi |
| Water Area: | 35 sq mi |
| Coordinates: | 48.6438, -115.1455 |
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21,175 residents live across 7 ZIPs covering 3,587 sq mi, served by 7 distinct USPS-recognized cities.
Population moved from 19,455 to 21,175 from 2014 to 2024 — a +8.8% change. 4 ZIPs gained residents, 3 lost.
The county's wealthiest ZIP 59934 (Trego, $108,875 median) and poorest ZIP 59935 (Troy, $39,712) are 42.3 miles apart — a 2.7× income gap across local geography.
Median home values vary 1.4× across this county — from $272,000 in 59923 (Libby) to $371,400 in 59935 (Troy).
Educational attainment ranges from 15.5% bachelor's+ in 59935 (Troy) to 29.2% in 59934 (Trego) — the breadth of educational profiles across the area.
Within Montana, this is the #10 most populous of 56 counties and ranks #38 for median household income with the #18 fastest decade growth .
Weighted by population, the typical household earns about $48,941 across the county — reflecting what a typical resident sees, not a simple ZIP average.
18.9% of adults age 25+ hold a bachelor's degree or higher (3,089 of 16,303 reporting).
4 Standard delivery, 3 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.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 59923 | Libby | Standard | 10,450 | $44,980 | 1,571.9 | 8.8% |
| 59917 | Eureka | Standard | 4,920 | $50,139 | 308.3 | 14.1% |
| 59935 | Troy | Standard | 3,381 | $39,712 | 1,185.0 | -0.2% |
| 59930 | Rexford | Standard | 1,220 | $61,923 | 265.1 | 73.5% |
| 59934 | Trego | PO Box | 693 | $108,875 | 183.6 | 12.5% |
| 59918 | Fortine | PO Box | 509 | $67,250 | 21.2 | -32.3% |
| 59933 | Stryker | PO Box | 2 | — | 51.9 | -97.3% |