There are 2 US Post Offices in Gilchrist County serving a total of 16,884 residents equating to 8,442 residents per post office. It's estimated that approximately 26,949 packages are handled across the 2 county post offices annually. Gilchrist County is a rural county located in the U.S. state of Florida. As of the 2010 census, the population was 16,939. The county seat is Trenton, Florida. Gilchrist County is included in the Gainesville, FL Metropolitan Statistical Area."