Martha Lake is a city located in the Washington region of the United States. During the most recent census, Martha Lake had a population of 15,473. Martha Lake is the 82nd most poplulated city in the Washington region, the 2,775th most populated city in the United States and the 16,274th most populated city in the world. Martha Lake is in the America/Los Angeles timezone which is 7 hours behind UTC. Martha Lake adjusts the hour with daylight savings time during the winter months.