| Oatfield to Olympia Heights (Florida) | 2,694.26 mi (4,335.99 km) |
| Oatfield to Omaha (Nebraska) | 1,357.65 mi (2,184.92 km) |
| Oatfield to On Top of the World Designated Place (Florida) | 2,452.55 mi (3,947.00 km) |
| Oatfield to Onalaska (Wisconsin) | 1,536.54 mi (2,472.82 km) |
| Oatfield to Oneida (New York) | 2,295.41 mi (3,694.11 km) |
| Oatfield to Oneonta (New York) | 2,339.07 mi (3,764.38 km) |
| Oatfield to Ontario (California) | 828.87 mi (1,333.93 km) |
| Oatfield to Ontario (Oregon) | 291.91 mi (469.78 km) |
| Oatfield to Opa-locka (Florida) | 2,690.16 mi (4,329.39 km) |
| Oatfield to Opelika (Alabama) | 2,158.64 mi (3,474.00 km) |
| Oatfield to Opelousas (Louisiana) | 1,936.76 mi (3,116.91 km) |
| Oatfield to Orange (California) | 840.94 mi (1,353.36 km) |
| Oatfield to Orange (Texas) | 1,880.10 mi (3,025.74 km) |
| Oatfield to Orange City (Florida) | 2,507.12 mi (4,034.82 km) |
| Oatfield to Orangeburg (South Carolina) | 2,342.86 mi (3,770.47 km) |
