Sayreville is a city located in the New Jersey region of the United States. During the most recent census, Sayreville had a population of 42,704. Sayreville is the 35th most poplulated city in the New Jersey region, the 971st most populated city in the United States and the 7,815th most populated city in the world. Sayreville is in the America/New York timezone which is 4 hours behind UTC. Sayreville adjusts the hour with daylight savings time during the winter months.