ZIP code · Rock Island · Washington · United States
ZIP code 98850 — Rock Island
ZIP code 98850 serves Rock Island, Washington.
- Postal code
- 98850Single source Value from one source, not cross-checked.
- City
- Rock Island
- County
- Douglas FIPS 53017
- State
- Washington
- Country
- United States
- Coordinates
- 47.3706, -120.1378 — precision precise (locality)
View on OpenStreetMap - Population
- 1,825 (ZCTA, ACS 5-year)
- Population density
- 24 / sq mi
- Land area
- 76.3 sq mi (197.5 km²) (ZCTA, ACS 5-year)
- Median household income
- $76,250
- Per-capita income
- $25,325
- Median age
- 37
- Households
- 655
- Housing units
- 680
- Median home value
- $331,100
- Median gross rent
- $1,183 / month
- Congressional district
- WA-4 (119th Congress)
- USDA hardiness zone
- 7a (0 to 5 °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
- 509 (from the nearest rate centre)Telephone 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 98850 with another ZIP · ZIPs within 25 miles · distance from 98850
Map of ZIP code 98850
Climate — monthly normals
Warmest month Jul (avg high 88°F), coldest Jan (avg low 24°F).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 34 | 42 | 53 | 62 | 72 | 78 | 88 | 86 | 77 | 61 | 44 | 33 |
| Avg low °F | 24 | 27 | 34 | 40 | 49 | 55 | 62 | 61 | 53 | 41 | 31 | 25 |
| Precip in | 1.0 | 0.8 | 0.7 | 0.6 | 0.8 | 0.5 | 0.2 | 0.2 | 0.2 | 0.6 | 0.8 | 1.3 |
NOAA 1991–2020 climate normals from the nearest station: WENATCHEE PANGBORN AP (3.5 mi) · NOAA NCEI
Places in ZIP 98850
- 1 schools
- 2 restaurants & cafés
- 1 parks
- 1 playgrounds
- 1 post offices
- 1 places of worship
- 2 gas stations
- 2 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