| ZIP Codes: | 12 ZIP Codes (10 Standard, 1 PO Box, 1 Unique) [See All] |
| Area Codes: | 208 / 986 |
| Timezone: | Pacific (GMT -08:00) |
| Local Time: | 2:11:57 PM |
| Population: | 42,103 [See All] |
| FIPS: | 16057 |
| CBSA: | Moscow, ID |
| Land Area: | 1,276 sq mi |
| Water Area: | 6 sq mi |
| Coordinates: | 46.7761, -116.7604 |
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42,103 residents live across 12 ZIPs covering 1,276 sq mi, served by 11 distinct USPS-recognized cities.
Population moved from 38,794 to 42,103 from 2014 to 2024 — a +8.5% change. 9 ZIPs gained residents, 3 lost.
The county's wealthiest ZIP 83872 (Viola, $100,242 median) and poorest ZIP 83535 (Juliaetta, $57,647) are 26.2 miles apart — a 1.7× income gap across local geography.
Median home values vary 1.8× across this county — from $293,800 in 83535 (Juliaetta) to $526,300 in 83872 (Viola).
Density varies 2143× across the county — from 6 people/sq mi in 83537 (Kendrick) to 12,131 in 83844 (Moscow).
Educational attainment ranges from 21.5% bachelor's+ in 83535 (Juliaetta) to 48.9% in 83843 (Moscow) — the breadth of educational profiles across the area.
Within Idaho, this is the #9 most populous of 46 counties and ranks #10 for median household income with the #31 fastest decade growth .
Hosts 1 single-entity Unique ZIP: 83844University Of Idaho .
Weighted by population, the typical household earns about $66,759 across the county — reflecting what a typical resident sees, not a simple ZIP average.
42.6% of adults age 25+ hold a bachelor's degree or higher (10,614 of 24,892 reporting). The most-educated ZIPs cluster around Moscow.
10 Standard delivery, 1 PO Box only, 1 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 |
|---|---|---|---|---|---|---|
| 83843 | Moscow | Standard | 26,591 | $59,444 | 121.6 | 2.0% |
| 83844 | Moscow | Unique | 2,971 | — | 0.2 | 90.9% |
| 83855 | Potlatch | Standard | 2,260 | $84,423 | 113.3 | 4.2% |
| 83871 | Troy | Standard | 2,240 | $89,750 | 106.1 | 6.5% |
| 83832 | Genesee | Standard | 1,961 | $91,250 | 146.0 | 31.9% |
| 83823 | Deary | Standard | 1,559 | $78,345 | 226.1 | 21.6% |
| 83535 | Juliaetta | Standard | 1,143 | $57,647 | 50.8 | -3.5% |
| 83537 | Kendrick | Standard | 1,125 | $71,917 | 198.7 | 4.4% |
| 83857 | Princeton | Standard | 1,074 | $78,185 | 66.9 | 44.5% |
| 83872 | Viola | Standard | 818 | $100,242 | 34.5 | 41.5% |
| 83834 | Harvard | Standard | 189 | $98,594 | 107.7 | -33.7% |
| 83806 | Bovill | PO Box | 172 | $43,125 | 104.4 | -33.3% |