There are 12 US Post Offices in Putnam County serving a total of 51,342 residents equating to 4,279 residents per post office. It's estimated that approximately 81,948 packages are handled across the 12 county post offices annually. Putnam County is a county located in the U.S. state of West Virginia. As of the 2010 census, the population was 55,486. Its county seat is Winfield. The county was founded in 1848 and is named for Israel Putnam, who was a hero in the French and Indian War and a general in the American Revolutionary War. Putnam County is part of the Huntington-Ashland, WV-KY-OH Metropolitan Statistical Area, which is also included in the Charleston-Huntington-Ashland, WV-OH-KY Combined Statistical Area."