[3] The county is named after Thomas Glascock,[4] a soldier in the War of 1812, general in the First Seminole War and U.S. representative.

[5] It is the fourth-smallest county in Georgia by area.

The vast majority of Glascock County is located in the Upper Ogeechee River sub-basin of the Ogeechee River basin, with just the very northeastern corner of the county, northeast of State Route 80, located in the Brier Creek sub-basin of the Savannah River basin.

[6] As of the 2020 United States census, there were 2,884 people, 1,108 households, and 726 families residing in the county.

In addition, Republican percentages have been in the 80s since 2004, and the last Democrat to win the county was Georgian Jimmy Carter in 1980.