| ZIP Codes: | 22 ZIP Codes (17 Standard, 4 PO Box, 1 Unique) [See All] |
| Area Code: | 509 |
| Timezone: | Pacific (GMT -08:00) |
| Local Time: | 2:14:17 PM |
| Population: | 47,284 [See All] |
| FIPS: | 53075 |
| CBSA: | Pullman, WA |
| Land Area: | 2,271 sq mi |
| Water Area: | 14 sq mi |
| Coordinates: | 46.9359, -117.4164 |
| Quick Link: |
47,284 residents live across 22 ZIPs covering 2,271 sq mi, served by 21 distinct USPS-recognized cities.
Population moved from 46,204 to 47,284 from 2014 to 2024 — a +2.3% change. 8 ZIPs gained residents, 12 lost.
The county's wealthiest ZIP 99113 (Colton, $104,643 median) and poorest ZIP 99143 (Lacrosse, $38,214) are 36.7 miles apart — a 2.7× income gap across local geography.
Median home values vary 3.5× across this county — from $123,600 in 99143 (Lacrosse) to $435,900 in 99163 (Pullman).
Density varies 3898× across the county — from 1 people/sq mi in 99143 (Lacrosse) to 5,233 in 99102 (Albion).
Educational attainment ranges from 17.8% bachelor's+ in 99170 (Rosalia) to 61.3% in 99163 (Pullman) — the breadth of educational profiles across the area.
Within Washington, this is the #22 most populous of 39 counties and ranks #27 for median household income .
Hosts 1 single-entity Unique ZIP: 99164Washington State University .
Weighted by population, the typical household earns about $54,535 across the county — reflecting what a typical resident sees, not a simple ZIP average.
49.6% of adults age 25+ hold a bachelor's degree or higher (12,270 of 24,736 reporting).
17 Standard delivery, 4 PO Box only, 1 single-entity Unique ZIPs serve this county.
1 ZIP in this county where more than 60% of adults 25+ hold a bachelor's degree — typically college campuses, research enclaves, or tech corridors.
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 |
|---|---|---|---|---|---|---|
| 99163 | Pullman | Standard | 34,022 | $48,231 | 203.1 | 5.4% |
| 99111 | Colfax | Standard | 4,038 | $73,393 | 293.0 | -4.4% |
| 99161 | Palouse | Standard | 1,435 | $87,464 | 78.0 | 0.9% |
| 99170 | Rosalia | Standard | 926 | $58,750 | 166.4 | -7.4% |
| 99171 | Saint John | Standard | 895 | $53,333 | 265.4 | -8.6% |
| 99033 | Tekoa | Standard | 832 | $58,750 | 47.7 | -13.5% |
| 99130 | Garfield | Standard | 693 | $82,000 | 74.3 | -4.4% |
| 99179 | Uniontown | Standard | 645 | $79,063 | 59.5 | 7.0% |
| 99125 | Endicott | Standard | 611 | $52,569 | 218.7 | 21.2% |
| 99143 | Lacrosse | Standard | 585 | $38,214 | 435.8 | -7.3% |
| 99158 | Oakesdale | Standard | 561 | $78,375 | 84.6 | -21.0% |
| 99113 | Colton | Standard | 560 | $104,643 | 106.6 | -14.1% |
| 99102 | Albion | PO Box | 495 | $56,833 | 0.1 | 11.5% |
| 99128 | Farmington | Standard | 259 | $58,942 | 60.4 | -29.6% |
| 99017 | Lamont | Standard | 230 | $58,958 | 106.5 | 20.4% |
| 99176 | Thornton | Standard | 163 | $128,000 | 47.8 | -17.3% |
| 99333 | Hooper | PO Box | 151 | $98,315 | 1.7 | 297.4% |
| 99149 | Malden | PO Box | 100 | $26,250 | 0.4 | -42.2% |
| 99174 | Steptoe | PO Box | 69 | $50,179 | 0.0 | 13.1% |
| 99136 | Hay | Standard | 14 | $87,708 | 18.0 | -57.6% |
| 99164 | Pullman | Unique | — | — | 0.0 | — |
| 99104 | Belmont | Standard | — | — | 2.7 | — |