Maple Valley is a city in King County, Washington, United States. The population was 22,684 at the 2010 census. The population was 25,125 at the 2014 estimate.
The area was settled in 1879 by three men who were improving a trail and brought their families in. When a name for a future community was proposed, the names Vine Maple Valley and Maple Ridge were suggested. A vote was taken by writing the names on slips of paper and placing them in a hat. Vine Maple Valley won by 2/3, but the word "Vine" was later cut by the post office because it made the name too long.
The town's early history mainly had to do with coal, lumber milling to build homes, and a railroad which ran through town.The city was officially incorporated on August 31, 1997. Today, the mostly residential city has shopping centers, gas stations, and housing. The Maple Valley Historical Society keeps records on the city's past, with two historical museums holding artifacts such as the city's first fire engine and photographs of old places in and around the city like Gaffney's Grove.