There are 9 US Post Offices in Chesterfield County serving a total of 289,577 residents equating to 32,175 residents per post office. It's estimated that approximately 462,197 packages are handled across the 9 county post offices annually. Chesterfield County is a United States county located just south of Richmond in the Commonwealth of Virginia. The county borders are primarily defined by the James River to the north, and the Appomattox River to the South. Its county seat is Chesterfield Court House. Chesterfield County was formed in 1749 from parts of Henrico County. It was named for Philip Stanhope, 4th Earl of Chesterfield, a prominent English statesman who had been the Lord Lieutenant of Ireland. As of the 2010 census, the population was 316,236, making it the third-most populous county in Virginia (behind Fairfax County and Prince William County, respectively). In July 2014, the population was estimated to be 330,043. Chesterfield County is part of the Greater Richmond Region, and much of the northern portion of the county is referred to as Richmond's \"South Side\"."