There are 26 US Post Offices in Carroll County serving a total of 45,395 residents equating to 1,746 residents per post office. It's estimated that approximately 72,455 packages are handled across the 26 county post offices annually. Carroll County is a county located in the state of New Hampshire, in the United States. As of the 2010 census, the population was 47,818, making it the third-least populous county in New Hampshire. Its county seat is Ossipee. The county was created in 1840 and organized at Ossipee from towns removed from Strafford County. It was named in honor of Charles Carroll of Carrollton, who had died in 1832, the last surviving signer of the United States Declaration of Independence."