| Sumter to Orangeburg (South Carolina) | 41.15 mi (66.23 km) |
| Sumter to Orangevale (California) | 2,277.71 mi (3,665.62 km) |
| Sumter to Orchards (Washington) | 2,347.63 mi (3,778.14 km) |
| Sumter to Orcutt (California) | 2,267.50 mi (3,649.19 km) |
| Sumter to Oregon (Ohio) | 558.06 mi (898.11 km) |
| Sumter to Oregon (Wisconsin) | 788.02 mi (1,268.20 km) |
| Sumter to Oregon City (Oregon) | 2,348.57 mi (3,779.66 km) |
| Sumter to Orem (Utah) | 1,769.82 mi (2,848.25 km) |
| Sumter to Orinda (California) | 2,334.72 mi (3,757.36 km) |
| Sumter to Orland Park (Illinois) | 668.07 mi (1,075.16 km) |
| Sumter to Orlando (Florida) | 381.48 mi (613.92 km) |
| Sumter to Ormond Beach (Florida) | 323.34 mi (520.36 km) |
| Sumter to Oro Valley (Arizona) | 1,765.19 mi (2,840.79 km) |
| Sumter to Oroville (California) | 2,292.07 mi (3,688.73 km) |
| Sumter to Oshkosh (Wisconsin) | 822.37 mi (1,323.48 km) |
