Vernonburg is a town in Chatham County, Georgia, United States, about 10 miles south of downtown Savannah. It is located at a sharp curve along the Vernon River, a tidal creek. The population was 139 at the 2020 census.

Chatham County is located in the U.S. state of Georgia, 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.