[3] Letters to Miss Celie in the movie The Color Purple (film) by Steven Spielberg, based on the novel The Color Purple by Alice Walker, are addressed to "Hartwell County, Georgia" suggesting that the movie is set either in Hartwell or Hart County.

Most of the southern three-quarters of Hart County is located in the Upper Savannah River sub-basin of the larger Savannah River basin, with the exception of two slivers of the county, south of Royston and west of Bowersville, which are located in the Broad River sub-basin of the Savannah River basin.

[5] As of the 2020 United States Census, there were 25,828 people, 9,853 households, and 6,743 families residing in the county.

As of the 2010 United States census, there were 25,213 people, 10,121 households, and 6,998 families living in the county.

[17] In terms of ancestry, 13.6% were American, 8.4% were English, 7.4% were Irish, and 6.6% were German.

[20] As of the census[21] of 2000, there were 22,997 people, 9,106 households, and 6,610 families living in the county.

The racial makeup of the county was 79.09% White, 19.36% Black or African American, 0.15% Native American, 0.53% Asian, 0.24% from other races, and 0.63% from two or more races.

24.40% of all households were made up of individuals, and 10.60% had someone living alone who was 65 years of age or older.