Jefferson is a city located in the Virginia region of the United States. During the most recent census, Jefferson had a population of 28,487. Jefferson is the 36th most poplulated city in the Virginia region, the 1,530th most populated city in the United States and the 10,636th most populated city in the world. Jefferson is in the America/New York timezone which is 4 hours behind UTC. Jefferson adjusts the hour with daylight savings time during the winter months.