There are 25 US Post Offices in Pulaski County serving a total of 414,524 residents equating to 16,581 residents per post office. It's estimated that approximately 661,627 packages are handled across the 25 county post offices annually. Pulaski County is a county in the U.S. state of Arkansas with a population of 392,664, making it the most populous county in Arkansas. Its county seat is Little Rock, which is also Arkansas's capital and largest city. Pulaski County is Arkansas's fifth county, formed on December 15, 1818, alongside Clark and Hempstead counties. The county is named for Count Casimir Pulaski, a Polish volunteer who saved George Washington's life during the American Revolutionary War. Pulaski County is included in the Little Rock\u2013North Little Rock\u2013Conway, AR Metropolitan Statistical Area which had 731,612 people in the 2015 census estimates. The Little Rock, North Little Rock Combined Statistical Area had 904,469 people in the 2015 census estimates.