From its county population in 2000 of 26126 to its current population estimate of 27282, the county has experienced a growth change of 1156.
Toombs County was created in 1905 from Emanuel, Montgomery, and Tattnall counties. It was named for Robert Toombs, a former U.S. congressman and senator who went on to serve the Confederacy as secretary of state and brigadier general.
Lyons, the county seat, was incorporated in 1897. It was named in honor of the man who convinced the Seaboard Air Line Railway to build tracks through the town.
Tobacco was a large part of the county's early economy, but for decades the county's most famous crop has been the sweet Vidalia onion, which gave Vidalia the nickname "Sweet Onion Capital of the World." The onion is sold all over the United States and attracts tourists to Toombs County for the annual Vidalia Onion Festival.