Coulee Dam is a town in Okanogan County, Washington, home to about 1,595 people across 0.7 square miles. Its ZIP code is 99116.
Homes sold for a median of $165 per square foot in the three months ending August 2026, a buyer’s market.
Mostly Coulee Dam; also Grand Coulee
Each card is that ZIP code’s whole market, including any part outside Coulee Dam. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Coulee Dam’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)71 miles away |
|---|---|
| Nearest city of 250,000+ | Seattle, WA161 miles away |
Straight-line distances from the center of Coulee Dam; 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 Dam had 1,211 residents in the 2020 census, up 16% since 2000.
It’s the 345th largest of 628 towns in Washington by population.
Okanogan County grew from 4,689 residents in 1900 to 42,104 in 2020.
Okanogan 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 23°F. About 11.2 inches of rain and melted snow fall in a typical year.
Source: NOAA 1991–2020 climate normals, Coulee Dam 1 Sw, WA weather station (6 miles away).
8,819 jobs at 1,202 businesses in Okanogan 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 Dam.
Nearest hospitals
Providers with an office here
| Dentists | 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.
Public schools here are run by Grand Coulee Dam School District. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Lake Roosevelt ElementaryCoulee Dam | Pre-K–6 | 354 | Public | 4.8 mi |
| Lake Roosevelt Jr/Sr High SchoolCoulee Dam | 7–12 | 308 | Public | 4.8 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 Grand Coulee.
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.