| Sumter to Odenton (Maryland) | 409.40 mi (658.87 km) |
| Sumter to Odessa (Texas) | 1,278.79 mi (2,058.02 km) |
| Sumter to Ogden (Utah) | 1,789.64 mi (2,880.14 km) |
| Sumter to Oildale (California) | 2,183.62 mi (3,514.20 km) |
| Sumter to Ojus (Florida) | 551.74 mi (887.94 km) |
| Sumter to Okemos (Michigan) | 643.51 mi (1,035.63 km) |
| Sumter to Oklahoma City (Oklahoma) | 976.96 mi (1,572.27 km) |
| Sumter to Okmulgee (Oklahoma) | 892.67 mi (1,436.61 km) |
| Sumter to Olathe (Kansas) | 870.62 mi (1,401.13 km) |
| Sumter to Old Jamestown (Missouri) | 645.43 mi (1,038.72 km) |
| Sumter to Oldsmar (Florida) | 428.59 mi (689.75 km) |
| Sumter to Olean (New York) | 572.60 mi (921.50 km) |
| Sumter to Olive Branch (Mississippi) | 543.04 mi (873.94 km) |
| Sumter to Olivehurst (California) | 2,293.65 mi (3,691.28 km) |
| Sumter to Olney (Maryland) | 404.20 mi (650.50 km) |
