ZIP code · Rosalia · Washington · United States
ZIP code 99170 — Rosalia
ZIP code 99170 serves Rosalia, Washington.
- Postal code
- 99170Single source Value from one source, not cross-checked.
- City
- Rosalia
- County
- Whitman FIPS 53075
- State
- Washington
- Country
- United States
- Coordinates
- 47.2218, -117.4147 — precision precise (locality)
View on OpenStreetMap - Population
- 1,015 (ZCTA, ACS 5-year)
- Population density
- 6 / sq mi
- Land area
- 173.1 sq mi (448.3 km²) (ZCTA, ACS 5-year)
- Median household income
- $75,208
- Per-capita income
- $38,008
- Median age
- 46.2
- Households
- 411
- Housing units
- 475
- Median home value
- $216,100
- Median gross rent
- $722 / month
- Congressional district
- WA-5 (119th Congress)
- USDA hardiness zone
- 6b (-5 to 0 °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 99170 with another ZIP · ZIPs within 25 miles · distance from 99170
Map of ZIP code 99170
Climate — monthly normals
Warmest month Aug (avg high 86°F), coldest Dec (avg low 24°F).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 37 | 42 | 50 | 58 | 67 | 73 | 85 | 86 | 76 | 61 | 45 | 36 |
| Avg low °F | 25 | 26 | 31 | 35 | 42 | 47 | 51 | 51 | 44 | 35 | 29 | 24 |
| Precip in | 2.0 | 1.7 | 1.9 | 1.6 | 1.7 | 1.3 | 0.5 | 0.4 | 0.6 | 1.5 | 2.5 | 2.7 |
NOAA 1991–2020 climate normals from the nearest station: ROSALIA (2.5 mi) · NOAA NCEI
Places in ZIP 99170
- 2 schools
- 1 supermarkets
- 3 restaurants & cafés
- 5 parks
- 1 libraries
- 3 places of worship
- 2 EV charging 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