Maple Valley is a city in King County, Washington, United States. The population was 22,684 at the 2010 census. The population was 25,686 at the 2015 estimate.
Maple Valley is located at 47°21′58″N 122°2′41″W (47.366160, -122.044692). According to the United States Census Bureau, the city has a total area of 5.90 square miles (15.28 km²), of which, 5.72 square miles (14.81 km²) is land and 0.18 square miles (0.47 km²) is water.
The main bodies of water in the city limits are Lake Wilderness, Lake Lucerne, Rock Creek, and part of Pipe Lake. The Cedar River passes through unincorporated King County very near the northeastern border of the city.
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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