Monroe is a city and the county seat of Walton County, Georgia, United States. It is located both one hour east of Atlanta via US 78 and GA 1…Monroe is a city and the county seat of Walton County, Georgia, United States. It is located both one hour east of Atlanta via US 78 and GA 138 to I-20 and east of Hartsfield–Jackson International Airport and is one of the exurban cities in the Atlanta metropolitan area. The population was 14,928 at the 2020 U.S. census.