Maple Valley is located in King County, Washington. The population was 22,684 at the 2010 census.

The median income for a household in the city was $67,159, and the median income for a family was $70,008. Males had a median income of $50,623 versus $34,097 for females. The per capita income for the city was $24,859. About 2.1% of families and 2.6% of the population were below the poverty line, including 2.4% of those under age 18 and 3.7% of those age 65 and over. Based on per capita income, one of the more reliable measures of affluence, Maple Valley ranks 93rd of 522 areas in the state of Washington to be ranked.

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City of Maple Valley, Washington