Cottage Lake is a city located in the Washington region of the United States. During the most recent census, Cottage Lake had a population of 22,494. Cottage Lake is the 51st most poplulated city in the Washington region, the 1,980th most populated city in the United States and the 12,642nd most populated city in the world. Cottage Lake is in the America/Los Angeles timezone which is 7 hours behind UTC. Cottage Lake adjusts the hour with daylight savings time during the winter months.