- Geology--South Carolina--Union County--Maps1
- Gilliam, Roosevelt, 1932---Interviews.1
- Gist, Lugene, 1915---Interviews.1
- Gist, William Henry, 1807-1874--Homes and haunts--Pictorial works4
- Grain--South Carolina1
- Greer, Ralph, 1928---Interviews.1
- High school athletes--South Carolina--Union County--History--20th century.1
- High school athletes--South Carolina--Union County--History.4
- Historic buildings74
- Historic buildings--Conservation and restoration27
- Historic house museums78
- Historic sites992
- Historical reenactments10
- Hospitals--South Carolina--Union2
- Insurance, Fire--South Carolina--Carlisle--Maps1
- Insurance, Fire--South Carolina--Jonesville--Maps1
- Insurance, Fire--South Carolina--Union--Maps5
- Interior architecture--South Carolina--Union County--Pictorial works5
- Interiors21
- Jails--South Carolina--Union--Pictorial works1