Onalaska, WA is a city located in Lewis County, Washington and has a land area of 126.01 square miles (326.36 km2). The water area for the city is 0.04 square miles or 0.10 km2. There is one unique zip code in Onalaska, Washington and it is 98570. The area code(s) for Onalaska is 360/564.
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