Montesano, WA is a city located in Grays Harbor County, Washington and has a land area of 414.70 square miles (1,074.07 km2). The water area for the city is 5.84 square miles or 15.13 km2. There is one unique zip code in Montesano, Washington and it is 98563. The area code(s) for Montesano is 360/564.
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