Maple Valley is located at 47°21′58′′N 122°2′41′′W (47°21′58′′N 122°2′41′′W = 47°21′58′′N 122° (47.366160, -122.044692). 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, according to the United States Census Bureau.
Within the municipal borders, the major bodies of water are Lake Wilderness, Lake Lucerne, Rock Creek, and a portion of Pipe Lake. The Cedar River runs through unincorporated King County, quite close to the city’s northeastern border. Hobart, Fairwood, and Ravensdale, two unincorporated King County census-designated areas, as well as the cities of Renton, Kent, and Black Diamond, all border the city.
As of the 2010 census, the city had a population of 22,684 people, 7,679 households, and 6,159 families. There were 3,965.7 persons per square mile (1,531.2 inhabitants per km2). There were 7,997 dwelling units at an average density of 1,398.1 dwelling units per square mile (539.8 dwelling units per km2). The city was 85.8% White, 2.1 percent African American, 0.5 percent Native American, 4.5 percent Asian, 0.4 percent Pacific Islander, 1.7 percent other races, and 5.0 percent of those who identified as having two or more races. Latino or Hispanic people of any race made up 5.7 percent of the population. (Source: Wikipedia)