Brookhaven is a town located in the Pennsylvania region of the United States. During the most recent census, Brookhaven had a population of 8,006. Brookhaven is the 133rd most poplulated city in the Pennsylvania region, the 4,650th most populated city in the United States and the 23,719th most populated city in the world. Brookhaven is in the America/New York timezone which is 4 hours behind UTC. Brookhaven adjusts the hour with daylight savings time during the winter months.