Onalaska is a community in Lewis County, Washington, home to about 848 people across 1.6 square miles. It has no ZIP code of its own: it’s part of 98570.
Homes sold for a median of $293 per square foot in the three months ending August 2026, a buyer’s market.
Each card is that ZIP code’s whole market, including any part outside Onalaska. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Onalaska’s story and what everyday life there is like, for people thinking about moving in.
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| Nearest major airport | Seattle–Tacoma International Airport (SEA)63 miles away |
|---|---|
| Closer regional airport | Olympia Regional Airport (OLM)29 miles away |
| Nearest city of 250,000+ | Portland, OR72 miles away |
Straight-line distances from the center of Onalaska; 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.
Onalaska had 657 residents in the 2020 census, up 6% since 2010.
It’s the 409th largest of 628 towns in Washington by population.
Lewis County grew from 15,157 residents in 1900 to 82,149 in 2020.
Lewis County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 81°F in summer, and winter lows average 33°F. About 58.8 inches of rain and melted snow fall in a typical year, with about 3 inches of snow.
Source: NOAA 1991–2020 climate normals, Mayfield Pwr Plt, WA weather station (7 miles away).
22,275 jobs at 1,990 businesses in Lewis County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
8 doctors and other health care providers list an office in Onalaska.
Nearest hospitals
Providers with an office here
| Specialist doctors | 1 |
|---|---|
| Nurse practitioners and physician assistants | 3 |
| Mental health providers | 3 |
| 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.
Parks (3 nearby)
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 Onalaska School District. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Onalaska Elementary SchoolOnalaska | Pre-K–5 | 437 | Public | 0.9 mi |
| Onalaska Middle SchoolOnalaska | 6–8 | 195 | Public | 0.8 mi |
| Onalaska High SchoolOnalaska | 9–12 | 281 | Public | 0.8 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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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.