Leonia is a town located in the New Jersey region of the United States. During the most recent census, Leonia had a population of 8,937. Leonia is the 197th most poplulated city in the New Jersey region, the 4,276th most populated city in the United States and the 22,418th most populated city in the world. Leonia is in the America/New York timezone which is 4 hours behind UTC. Leonia adjusts the hour with daylight savings time during the winter months.