ZIP code · Clarkston · Washington · United States
ZIP code 99403 — Clarkston
ZIP code 99403 serves Clarkston, Washington.
- Postal code
- 99403Single source Value from one source, not cross-checked.
- City
- Clarkston
- County
- Asotin FIPS 53003
- State
- Washington
- Country
- United States
- Coordinates
- 46.3946, -117.0645 — precision precise (locality)
View on OpenStreetMap - Population
- 20,483 (ZCTA, ACS 5-year)
- Population density
- 143 / sq mi
- Land area
- 143.5 sq mi (371.6 km²) (ZCTA, ACS 5-year)
- Median household income
- $67,424
- Per-capita income
- $38,214
- Median age
- 45.5
- Households
- 8,643
- Housing units
- 9,192
- Median home value
- $283,800
- Median gross rent
- $994 / month
- Congressional district
- WA-5 (119th Congress)
- USDA hardiness zone
- 7b (5 to 10 °F)Planting / growing zone from the 2023 USDA Plant Hardiness Zone Map: average annual extreme minimum temperature, 1991–2020.
- Time zone
- America/Los_Angeles (UTC−8 / UTC−7 DST)
- Area code
- 509Telephone area codes serving this ZIP (NANPA central-office assignments). A ZIP and an area code are different boundaries; at a border both codes may apply.
Tools: compare 99403 with another ZIP · ZIPs within 25 miles · distance from 99403
Map of ZIP code 99403
Climate — monthly normals
Warmest month Jul (avg high 91°F), coldest Dec (avg low 30°F).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 42 | 47 | 55 | 62 | 72 | 79 | 91 | 90 | 80 | 63 | 49 | 41 |
| Avg low °F | 30 | 32 | 36 | 41 | 48 | 54 | 61 | 60 | 52 | 42 | 35 | 30 |
| Precip in | 1.1 | 1.0 | 1.3 | 1.4 | 1.7 | 1.3 | 0.5 | 0.5 | 0.6 | 1.1 | 1.2 | 1.1 |
NOAA 1991–2020 climate normals from the nearest station: LEWISTON NEZ PERCE CO AP (2.7 mi) · NOAA NCEI
Places in ZIP 99403
- 9 schools
- 1 colleges & universities
- 1 hospitals & clinics
- 2 doctors & dentists
- 2 pharmacies
- 2 supermarkets
- 17 restaurants & cafés
- 3 bars & pubs
- 10 parks
- 6 playgrounds
- 3 gyms & sports centres
- 2 libraries
- 1 post offices
- 5 places of worship
- 5 banks
- 2 gas stations
- 2 EV charging stations
- 3 police & fire stations
Places mapped inside this ZIP’s ZCTA area in OpenStreetMap. OSM is community-maintained: counts reflect what has been mapped, and completeness varies by area — treat them as at-least figures. © OpenStreetMap contributors (ODbL) · Methodology
About this page
US ZIP codes have five digits. They are postal routing areas, not administrative boundaries: a ZIP can span more than one city or county, and the city shown is the primary USPS name for that code.
GeoNames · U.S. Census Bureau (ACS) · U.S. Census Bureau · NOAA NCEI · usda-phzm. Data generated on 2026-08-21. Methodology · Report an error on this page