| Number | County | Town | Size | Built | Verif | GPS | Description |
| SC-01-01 | Abbeville | Abbeville | 1856 | SSE of Abbeville. Frazier Pressley, octagon house. (N34 04.930 W82 18.132) | |||
| SC-07-01 | Beaufort | Hilton Head Island | 05-2013 | N32 08.332 W80 48.682 | In Hilton Head Island. At 149 Lighthouse Rd. Crazy Crab, hexagon bldg. | ||
| SC-07-02 | Hilton Head Island | 05-2013 | N32 08.320 W80 48.681 | In Hilton Head Island. At 147 Lighthouse Rd. Harbor Burger & Brew, octagon bldg. | |||
| SC-07-03 | Bluffton | 05-2013 | N32 13.857 W80 47.966 | E. of Bluffton. US278 E. 3.4 miles from jct with Bluffton Rd. N. of Bluffton, SW (right) on Fording Island Rd. Ext 0.35 miles to the bldg on the NE side of the road at 35. Sunset Bay Seafood Restaurant, 16 sided bldg. | |||
| SC-07-04 | Hilton Head Island | 05-2013 | N32 11.832 W80 41.890 | In Hilton Head Island. Burkes Beach Rd. SE 0.25 miles from jct with BR.US278, NE (left) on 2nd St. 0.1 miles, NW (curves N.) on Surfwatch Way 0.1 miles to the bldg on the E. side of the road. Marriot Surf Watch Resort, octagon bldg. | |||
| SC-07-05 | Hilton Head Island | 05-2013 | N32 08.331 W80 48.744 | In Hilton Head Island. At 149 Lighthouse Rd. Camp Hilton Head Shops #1, octagon bldg. | |||
| SC-07-06 | Hilton Head Island | 05-2013 | N32 08.337 W80 48.744 | Same as SC-07-05. Camp Hilton Head Shops #2, octagon bldg. | |||
| SC-10-01 | Charleston | St. Andrews | 05-2013 | N32 46.867 W79 57.907 | In St. Andrews. US17 (Savannah Hwy) E. 0.5 miles from jct with Wesley Dr. to the bldg on the N. side of the road. Holiday Inn, round bldg. | ||
| SC-17-?1 | Dillon | Hamer | NE of Hamer, True round bldg. (N34 29.846 W79 18.687) | ||||
| SC-23-01 | Greenville | Conestee | c1842 | In Conestee. McBee Methodist, octagon church. (N34 45.971 W82 21.204) | |||
| SC-30-01 | Laurens | Laurens | 53' | 1859 | In Laurens. At 619 E. Main St., at the corner of Woodrow and East Main Sts. Octagon house, apartments, 2 story, poured concrete, walls taper from 18" to 12" thick, no cupola. Built by Zelotes Lee Holmes. (N34 29.984 W81 59.927) |