Postal reference / United States
99403Clarkston, Washington
ZIP code 99403 is a United States postal code for Clarkston, Washington. Its county association is Asotin County. The map reference point is at 46.3946, -117.0645.
- State / territory
- Washington
- Recorded place name
- Clarkston
- County association
- Asotin
- Estimated coordinate
- 46.3946, -117.0645
View on OpenStreetMap - ZIP prefix
- 994 · 3 ZIP codes share it
- Data source
- GeoNames postal reference, snapshot September 26, 2026
GeoNames reference data. County associations may not include every intersecting county, place names are postal names rather than legal boundaries, and coordinates are approximate. This is not address validation.
Area
- Land area
- 143.492 sq mi (2023 Census Gazetteer)
Figures are for the ZIP Code Tabulation Area (ZCTA) that most closely matches this ZIP code, not an exact match to USPS delivery boundaries. Source: U.S. Census Bureau, 2023 Gazetteer + 2023 ACS 5-Year Estimates, retrieved 2026-09-27. How to read this data.
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Browse the other 715 ZIP codes recorded for Washington, sorted by code with place and county.
Washington directoryNearby ZIP code reference points
| ZIP code | Place | State | County association | Miles |
|---|---|---|---|---|
| 99179 | Uniontown | WA | Whitman | 9.2 |
| 83501 | Lewiston | ID | Nez Perce | 9.9 |
| 83540 | Lapwai | ID | Nez Perce | 13.1 |
| 83832 | Genesee | ID | Latah | 13.8 |
| 99113 | Colton | WA | Whitman | 14.4 |
| 99402 | Asotin | WA | Asotin | 18.2 |
| 99401 | Anatone | WA | Asotin | 18.4 |
| 83524 | Culdesac | ID | Nez Perce | 19.6 |
Straight-line distance between reference points. Nearby points do not prove that ZIP areas touch.
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