There are 18 US Post Offices in Nicholas County serving a total of 26,325 residents equating to 1,463 residents per post office. It's estimated that approximately 42,018 packages are handled across the 18 county post offices annually. Nicholas County is a county located in the U.S. state of West Virginia. As of the 2010 census, the population was 26,233. Its county seat is Summersville. The county was created in 1818 by the Virginia General Assembly and named for Virginia Governor Wilson Cary Nicholas."