Rock Island is a city in Douglas County, Washington, home to about 1,251 people across 1.1 square miles. Its ZIP code is 98850.
Homes sold for a median of $309 per square foot in the three months ending August 2026, a balanced market.
Each card is that ZIP code’s whole market, including any part outside Rock Island. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
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| Nearest major airport | Seattle–Tacoma International Airport (SEA)102 miles away |
|---|---|
| Closer regional airport | Pangborn Memorial Airport (EAT)4 miles away |
| Nearest city of 250,000+ | Seattle, WA105 miles away |
Straight-line distances from the center of Rock Island; driving is longer.
Source: Airports from OurAirports (scheduled passenger service); city centers and populations from the U.S. Census Bureau.
Source: Members of Congress from the congress-legislators project; districts from the Census Bureau’s relationship files; governor and mayor from Wikidata.
Rock Island had 1,279 residents in the 2020 census, up 48% since 2000.
It’s the 370th largest of 628 towns in Washington by population.
Douglas County grew from 4,926 residents in 1900 to 42,938 in 2020.
Douglas County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 88°F in summer, and winter lows average 24°F. About 7.8 inches of rain and melted snow fall in a typical year.
Source: NOAA 1991–2020 climate normals, Wenatchee Pangborn Ap, WA weather station (4 miles away).
8,674 jobs at 854 businesses in Douglas County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
2 doctors and other health care providers list an office in Rock Island.
Nearest hospitals
Providers with an office here
| Dentists | 1 |
|---|---|
| Mental health providers | 1 |
Source: Hospitals from CMS Hospital General Information (ratings are CMS overall star ratings); straight-line distances; providers from the CMS National Plan and Provider Enumeration System (NPPES), by practice address and primary specialty.
Parks (1 nearby)
Counts are within about 1 mile of the center of town.
Source: Map data © OpenStreetMap contributors (openstreetmap.org/copyright), as mapped by volunteers; it can miss places or include closed ones.
Public schools here are run by Eastmont School District. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Rock Island ElementaryRock Island | K–6 | 288 | Public | 0.9 mi |
Source: U.S. Department of Education, NCES: Common Core of Data (2024-2025) for public schools. Listed by address; we don’t rate schools.
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Town boundaries don’t always match ZIP codes: a ZIP code can cross into neighboring towns, and a town can share a ZIP code with its neighbors. Facts describe the town itself; market figures describe whole ZIP codes.