There are 8 US Post Offices in Bollinger County serving a total of 11,340 residents equating to 1,418 residents per post office. It's estimated that approximately 18,100 packages are handled across the 8 county post offices annually. Bollinger County is a county located in the southeastern part of the U.S. state of Missouri. As of the 2010 census, the county's population was 12,363. The county seat is Marble Hill. The county was officially organized in 1851. Bollinger County is part of the Cape Girardeau, MO-IL Metropolitan Statistical Area. The county is the home of the Missouri dinosaur and Blue Pond, the deepest natural pond in Missouri, is located in the southern portion of the county."