There are 8 US Post Offices in Noble County serving a total of 15,054 residents equating to 1,882 residents per post office. It's estimated that approximately 24,028 packages are handled across the 8 county post offices annually. Noble County is a county located in the U.S. state of Ohio. As of the 2010 census, the population was 14,645, making it the third-least populous county in Ohio. Its county seat is Caldwell. The county is named for Rep. Warren P. Noble of the Ohio House of Representatives, who was an early settler there."