Usk, WA is a city located in Pend Oreille County, Washington and has a land area of 162.43 square miles (420.69 km2). The water area for the city is 3.77 square miles or 9.76 km2. There is one unique zip code in Usk, Washington and it is 99180. The area code(s) for Usk is 509.
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