Zip Code 99403 — Clarkston, WA
99403 is a ZIP Code associated with Clarkston, WA, located within Asotin. The postal region supports an estimated population of 20,760 residents across Data Pending housing units, with a population density of 55.9 people per square mile.
WorldPlaceData database updated: October 2026
📍 View location on OpenStreetMap (46.381140, -117.259740)
| Data Metric | Local Statistic |
|---|
| Postal / Zip Code | 99403 |
| Primary City | Clarkston |
| State / Province | WA |
| County | Asotin |
| Total Population | 20,760 |
| Median Household Income | Data Pending |
| Total Housing Units | Data Pending |
| Population Density | 55.9 people/sq mi |
| Timezone | America/Los_Angeles |
How 99403 Compares
| Metric | ZIP 99403 | Asotin County | WA State Average |
|---|
| Population | 20,760 | 22,480 | 7,816,021 |
| Median Income | Data Pending | N/A | N/A |
| Population Density | 55.9 /sq mi | -- | -- |
Nearby ZIP Codes
Data Sources & Methodology: Geographic coordinates and ZIP Code assignments are derived from underlying geographic and postal datasets. Note that ZIP Codes are USPS postal delivery areas, while Census ZCTAs are statistical approximation areas. Read full methodology →