| ZIP Codes: | 6 ZIP Codes (4 Standard, 2 PO Box, 0 Unique) [See All] |
| Area Code: | 509 |
| Timezone: | Pacific (GMT -08:00) |
| Local Time: | 11:55:35 PM |
| Population: | 98,034 [See All] |
| FIPS: | 53021 |
| CBSA: | Kennewick-Richland, WA |
| Land Area: | 1,043 sq mi |
| Water Area: | 22 sq mi |
| Coordinates: | 46.5088, -118.9320 |
| Quick Link: |
98,034 residents live across 6 ZIPs covering 1,043 sq mi, served by 5 distinct USPS-recognized cities.
Population moved from 84,103 to 98,034 from 2014 to 2024 — a +16.6% change. 4 ZIPs gained residents, 1 lost.
The county's wealthiest ZIP 99330 (Eltopia, $140,093 median) and poorest ZIP 99343 (Mesa, $59,451) are 9.5 miles apart — a 2.4× income gap across local geography.
Median home values vary 2.2× across this county — from $253,000 in 99343 (Mesa) to $554,200 in 99330 (Eltopia).
Density varies 12× across the county — from 13 people/sq mi in 99330 (Eltopia) to 162 in 99301 (Pasco).
Educational attainment ranges from 11.4% bachelor's+ in 99326 (Connell) to 21.9% in 99301 (Pasco) — the breadth of educational profiles across the area.
Within Washington, this is the #14 most populous of 39 counties and ranks #9 for median household income with the #7 fastest decade growth .
Weighted by population, the typical household earns about $87,316 across the county — reflecting what a typical resident sees, not a simple ZIP average.
21.0% of adults age 25+ hold a bachelor's degree or higher (12,061 of 57,555 reporting).
4 Standard delivery, 2 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.