| Troy to Olympia (Washington) | 1,951.12 mi (3,140.03 km) |
| Troy to Olympia Heights (Florida) | 1,175.57 mi (1,891.90 km) |
| Troy to Omaha (Nebraska) | 669.10 mi (1,076.82 km) |
| Troy to On Top of the World Designated Place (Florida) | 932.32 mi (1,500.43 km) |
| Troy to Onalaska (Wisconsin) | 415.55 mi (668.76 km) |
| Troy to Oneida (New York) | 380.61 mi (612.54 km) |
| Troy to Oneonta (New York) | 411.37 mi (662.04 km) |
| Troy to Ontario (California) | 1,943.98 mi (3,128.54 km) |
| Troy to Ontario (Oregon) | 1,691.99 mi (2,722.99 km) |
| Troy to Opa-locka (Florida) | 1,164.18 mi (1,873.57 km) |
| Troy to Opelika (Alabama) | 696.16 mi (1,120.35 km) |
| Troy to Opelousas (Louisiana) | 968.15 mi (1,558.09 km) |
| Troy to Orange (California) | 1,962.54 mi (3,158.40 km) |
| Troy to Orange (Texas) | 1,042.11 mi (1,677.11 km) |
| Troy to Orange City (Florida) | 948.57 mi (1,526.58 km) |
