Coulee City is a town in Douglas County, Washington, home to about 439 people across 0.9 square miles. Its ZIP code is 99115.
Homes sold for a median of $155 per square foot in the three months ending August 2026, a buyer’s market.
Mostly Coulee City; also Banks Lake South
Each card is that ZIP code’s whole market, including any part outside Coulee City. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Coulee City’s story and what everyday life there is like, for people thinking about moving in.
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| Nearest major airport | Spokane International Airport (GEG)81 miles away |
|---|---|
| Closer regional airport | Pangborn Memorial Airport (EAT)46 miles away |
| Nearest city of 250,000+ | Seattle, WA143 miles away |
Straight-line distances from the center of Coulee City; 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.
Coulee City had 549 residents in the 2020 census, down 8% since 2000.
It’s the 490th 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 86°F in summer, and winter lows average 23°F. About 10.9 inches of rain and melted snow fall in a typical year.
Source: NOAA 1991–2020 climate normals, Hartline, WA weather station (10 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).
1 doctors and other health care providers list an office in Coulee City.
Nearest hospitals
Providers with an office here
| Chiropractors | 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.
Grocery stores
Libraries
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 Coulee-Hartline School District. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Coulee City ElementaryCoulee City | K–5 | 68 | Public | 1.4 mi |
| Coulee City Middle SchoolCoulee City | 6–8 | — | Public | 1.4 mi |
| Almira Coulee Hartline High SchoolCoulee City | 9–12 | 102 | Public | 1.5 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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Shares ZIP codes with Banks Lake South.
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.