Chatham County, Georgia Chatham County, Georgia Chatham County is a county in the U.S. state of Georgia, and is located on the state's Atlantic coast. The county seat and largest city is Savannah. One of the original counties of Georgia, Chatham County was created February 5, 1777, and is named after William Pitt, 1st Earl of Chatham. The U.S. Census Bureau's 2017 population estimate for Chatham County was 290,501 residents, making Chatham the most populous Georgia county outside the Atlanta metropolitan area. The official 2010 Census counted 265,128 residents in Chatham County. Chatham is the core county of the Savannah metropolitan area. According
Chatham Township, New Jersey that had taken its name and adopted the village form of government established in the United States for the new state of New Jersey. Shortly thereafter, Chatham adopted the borough form of government on March 1, 1897. Florham Park was formed from portions of the township on March 20, 1899. Most of Green Village has always been within the township's jurisdiction. In 1773, the village "John Day's Bridge", a community governed by the English township of Morris since its settlement in 1710, was renamed as, "Chatham", in honor of Sir William Pitt, a British prime minister and the first Earl