Sammamish is a city located in the Washington region of the United States. During the most recent census, Sammamish had a population of 45,780. Sammamish is the 22nd most poplulated city in the Washington region, the 909th most populated city in the United States and the 7,406th most populated city in the world. Sammamish is in the America/Los Angeles timezone which is 7 hours behind UTC. Sammamish adjusts the hour with daylight savings time during the winter months.