Macclenny is a city in Baker County, Florida, United States. The population was 4,459 at the 2000 census. It is the county seat of Baker County. As of 2004, the population recorded by the U.S. Census Bureau is 5,030. Macclenny apartments for rent comparison page shows most up to date rent information on Macclenny apartments and houses. Rent information is obtained from multiple rental sources but we cannot guarantee their accuracy.