There are 16 US Post Offices in Manatee County serving a total of 240,666 residents equating to 15,042 residents per post office. It's estimated that approximately 384,130 packages are handled across the 16 county post offices annually. Manatee County is a county in the U.S. state of Florida. As of the 2010 census, the population was 322,833. Its county seat and largest city is Bradenton. The county was created in 1855. It was named for the Florida manatee (commonly called a \"sea cow\" and distantly related to the elephant), which is endangered and Florida's official marine mammal. Manatee County is included in the North Port-Sarasota-Bradenton, FL Metropolitan Statistical Area. Features of Manatee County include access to the Southern part of Tampa Bay, the Sunshine Skyway Bridge, and the Manatee River. Rowing facilities are being developed in the area and the Upper Manatee River Canoe Trail has been created. There are several parks and preserves. About 1.8% of all of Florida's population lives in Manatee County and is ranks 16 for Florida counties in Population."