McDonough is a city in Henry County, Georgia, United States. It is allowance of the Atlanta metropolitan area. Its population was 22,084 at the 2010 census, up from 8,493 in 2000. The city is the county chair of Henry County. The unincorporated communities of Blacksville, Flippen, Kelleytown, and Ola are located close McDonough, and addresses in those communities have McDonough ZIP Codes.

The town was named for naval official Commodore Thomas Macdonough and founded in 1823 approaching a traditional town square design. The buildings surrounding the square are intact, although there are some vacancies. The county courthouse and historic jail building are upon the north side near the Welcome Center in a historically maintained Standard Oil assistance station, built in 1920. The station afterward houses the Main Street Program Office and Hospitality and Tourism Office.

One block east of the square, the town’s native cotton warehouse has been replaced in the appearance of the Henry County Judicial Center. In the thesame area the Henry County Courthouse Annex has an original oil upon canvas “Cotton Gin” (4+1⁄2 by 11 feet) by artiste Jean Charlot. He painted this oil in 1942 for the town state office. His works can be found anything over the world in anything from children’s books to large murals.

The town was a relay station upon the New York City to New Orleans stagecoach heritage and was related by new stage lines following Fayetteville and Decatur, and later than Macon by way of Jackson.