Maple Valley is a city located in the Washington region of the United States. During the most recent census, Maple Valley had a population of 22,684. Maple Valley is the 50th most poplulated city in the Washington region, the 1,965th most populated city in the United States and the 12,554th most populated city in the world. Maple Valley is in the America/Los Angeles timezone which is 7 hours behind UTC. Maple Valley adjusts the hour with daylight savings time during the winter months.