| ZIP Codes: | 2 ZIP Codes (1 Standard, 1 PO Box, 0 Unique) [See All] |
| Area Code: | 509 |
| Timezone: | Pacific (GMT -08:00) |
| Local Time: | 2:14:15 PM |
| Population: | 3,740 [See All] |
| FIPS: | 53013 |
| Land Area: | 758 sq mi |
| Water Area: | 5 sq mi |
| Coordinates: | 46.3850, -118.0031 |
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3,740 residents live across 2 ZIPs covering 758 sq mi, served by 2 distinct USPS-recognized cities.
Population moved from 3,860 to 3,740 from 2014 to 2024 — a -3.1% change. 0 ZIPs gained residents, 2 lost.
The county's wealthiest ZIP 99328 (Dayton, $72,756 median) and poorest ZIP 99359 (Starbuck, $61,000) are 22.0 miles apart — a 1.2× income gap across local geography.
Median home values vary 2.0× across this county — from $135,400 in 99359 (Starbuck) to $272,100 in 99328 (Dayton).
Density varies 110× across the county — from 5 people/sq mi in 99328 (Dayton) to 530 in 99359 (Starbuck).
Educational attainment ranges from 2.1% bachelor's+ in 99359 (Starbuck) to 24.0% in 99328 (Dayton) — the breadth of educational profiles across the area.
Within Washington, this is the #38 most populous of 39 counties and ranks #30 for median household income .
Weighted by population, the typical household earns about $72,461 across the county — reflecting what a typical resident sees, not a simple ZIP average.
23.2% of adults age 25+ hold a bachelor's degree or higher (669 of 2,878 reporting).
1 Standard delivery, 1 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.