Marion County is a county located in the west central portion of the U.S. state of Georgia. As of the 2020 census, the county had a population of 7,498. The county seat is Buena Vista. The county was created on December 14, 1827. The county was named for General Francis Marion of South Carolina.

Buena Vista is a city in Marion County, Georgia, United States. It is part of the Columbus, Georgia-Alabama metropolitan statistical area. The population was 1,585 at the 2020 census, down from 2,173 in 2010. Formerly known as "Pea Ridge", the city changed its name to Buena Vista in honor of Zachary Taylor's victory in the Mexican–American War. The city is the county seat of Marion County. It is the birthplace of baseball legend Josh Gibson and Medal of Honor recipient Luther H. Story.