There are 11 US Post Offices in Carroll County serving a total of 29,327 residents equating to 2,666 residents per post office. It's estimated that approximately 46,809 packages are handled across the 11 county post offices annually. Carroll County is a county located in the state of Ohio. As of the 2010 census, the population was 28,836. Its county seat is Carrollton. It is named for Charles Carroll of Carrollton, the last surviving signer of the Declaration of Independence. Carroll County is part of the Canton-Massillon, OH Metropolitan Statistical Area, which is also included in the Cleveland-Akron-Canton, OH Combined Statistical Area. It is in the Appalachian Ohio region."