| Carthage to Olympia Heights (Florida) | 1,138.92 mi (1,832.91 km) |
| Carthage to Omaha (Nebraska) | 298.84 mi (480.94 km) |
| Carthage to On Top of the World Designated Place (Florida) | 889.71 mi (1,431.86 km) |
| Carthage to Onalaska (Wisconsin) | 493.36 mi (793.99 km) |
| Carthage to Oneida (New York) | 1,064.71 mi (1,713.49 km) |
| Carthage to Oneonta (New York) | 1,082.93 mi (1,742.80 km) |
| Carthage to Ontario (California) | 1,322.27 mi (2,127.98 km) |
| Carthage to Ontario (Oregon) | 1,274.85 mi (2,051.67 km) |
| Carthage to Opa-locka (Florida) | 1,133.60 mi (1,824.35 km) |
| Carthage to Opelika (Alabama) | 593.84 mi (955.69 km) |
| Carthage to Opelousas (Louisiana) | 475.43 mi (765.13 km) |
| Carthage to Orange (California) | 1,338.70 mi (2,154.43 km) |
| Carthage to Orange (Texas) | 486.64 mi (783.17 km) |
| Carthage to Orange City (Florida) | 942.96 mi (1,517.56 km) |
| Carthage to Orangeburg (South Carolina) | 798.67 mi (1,285.33 km) |
