Montesano is a city in Grays Harbor County, Washington, United States. The population was 3,976 at the 2010 census. It is the county seat of Grays Harbor County.
Montesano is located at 46°59′9″N 123°35′52″W (46.985865, -123.597726). It is on the north slope of the Chehalis River valley, near the confluence of the Wynoochee River and Chehalis River. The town is bordered on the North by Lake Sylvia and on the west by Sylvia Creek.
According to the United States Census Bureau, the city has a total area of 10.58 square miles (27.40 km²), of which, 10.41 square miles (26.96 km²) is land and 0.17 square miles (0.44 km²) is water.
As of the census of 2010, there were 3,976 people, 1,563 households, and 1,031 families residing in the city. The population density was 381.9 inhabitants per square mile (147.5/km²). There were 1,684 housing units at an average density of 161.8 per square mile (62.5/km²). The racial makeup of the city was 100%White, 0.6% African American, 1.7% Native American, 1.4% Asian, 0.2% Pacific Islander, 0.6% from other races, and 3.4% from two or more races. Hispanic or Latino of any race were 3.3% of the population.
There were 1,563 households of which 31.0% had children under the age of 18 living with them, 48.6% were married couples living together, 11.7% had a female householder with no husband present, 5.7% had a male householder with no wife present, and 34.0% were non-families. 27.8% of all households were made up of individuals and 10.8% had someone living alone who was 65 years of age or older. The average household size was 2.39 and the average family size was 2.88.
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