| ZIP Codes: | 10 ZIP Codes (9 Standard, 1 PO Box, 0 Unique) [See All] |
| Area Code: | 701 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 11:14:07 PM |
| Population: | 436 [See All] |
| FIPS: | 38023 |
| Land Area: | 1,811 sq mi |
| Water Area: | 17 sq mi |
| Coordinates: | 48.8474, -104.1947 |
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3,709 residents live across 10 ZIPs covering 1,811 sq mi, served by 10 distinct USPS-recognized cities.
Population moved from 3,535 to 3,709 from 2014 to 2024 — a +4.9% change. 5 ZIPs gained residents, 5 lost.
The county's wealthiest ZIP 59258 (Reserve, $148,750 median) and poorest ZIP 59256 (Raymond, $36,607) are 25.5 miles apart — a 4.1× income gap across local geography.
Median home values vary 2.7× across this county — from $80,600 in 59256 (Raymond) to $215,600 in 59252 (Outlook).
Density varies 14× across the county — from 0 people/sq mi in 59252 (Outlook) to 6 in 59254 (Plentywood).
Educational attainment ranges from 20.5% bachelor's+ in 59275 (Westby) to 83.2% in 59211 (Antelope) — the breadth of educational profiles across the area.
Within Montana, this is the #59 most populous of 61 counties and ranks #59 for median household income with the #1 fastest decade growth .
On the national stage, Sheridan County is and #16 for decade growth .
Weighted by population, the typical household earns about $71,274 across the county — reflecting what a typical resident sees, not a simple ZIP average.
26.1% of adults age 25+ hold a bachelor's degree or higher (697 of 2,667 reporting).
9 Standard delivery, 1 PO Box only, 0 single-entity Unique ZIPs serve this county.
Median household income spans 4.1× between the wealthiest and poorest ZIPs — a sign of significant intra-county inequality.
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 |
|---|---|---|---|---|---|---|
| 59254 | Plentywood | Standard | 1,822 | $68,750 | 316.7 | -11.5% |
| 59275 | Westby | Standard | 436 | $49,141 | 276.6 | 49.8% |
| 59247 | Medicine Lake | Standard | 310 | $73,750 | 94.6 | -15.3% |
| 59211 | Antelope | Standard | 298 | — | 111.7 | 47.5% |
| 59256 | Raymond | PO Box | 258 | $36,607 | 88.0 | 171.6% |
| 59258 | Reserve | Standard | 184 | $148,750 | 258.6 | 65.8% |
| 59219 | Dagmar | Standard | 144 | $108,750 | 218.6 | -22.6% |
| 59257 | Redstone | Standard | 132 | — | 172.5 | 473.9% |
| 59252 | Outlook | Standard | 70 | $65,750 | 165.4 | -45.3% |
| 59242 | Homestead | Standard | 55 | $128,750 | 108.0 | -25.7% |