 Although Lee Field closed in the early 1960s, Camp Blanding continues to operate today as a base for military training.Clay County is also a popular choice of residence for military personnel stationed on bases in nearby Duval County (NAS Jacksonville, NS Mayport, and, before it closed, NAS Cecil Field).According to the U.S. Census Bureau, the county has a total area of , of which is land and (6.1%) is water.