There are 23 US Post Offices in Marion County serving a total of 147,130 residents equating to 6,397 residents per post office. It's estimated that approximately 234,836 packages are handled across the 23 county post offices annually. Marion County is a county located in the U.S. state of Florida. As of the 2010 census, the population was 331,298. Its county seat is Ocala. Marion County comprises the Ocala, FL Metropolitan Statistical Area."