There are 3 Post Offices in Barnwell County, South Carolina, serving a population of 21,788 people in an area of 549 square miles. There is 1 Post Office per 7,262 people, and 1 Post Office per 182 square miles.
In South Carolina, Barnwell County is ranked 28th of 46 counties in Post Offices per capita, and 44th of 46 counties in Post Offices per square mile.
Find addresses, phone numbers, fax numbers, hours & services for Barnwell County Post Offices.
United States Postal Service 476 Main Street Blackville, SC Mailbox Rental, Mailing Service, Postal Services
United States Postal Service 221 East Main Street Barnwell, SC Mailbox Rental, Mailing Service, Postal Services
United States Postal Service 10049 US Highway 78 Elko, SC Mailing Service, Postal Services