| Boone to Olympia Heights (Florida) | 728.82 mi (1,172.93 km) |
| Boone to Omaha (Nebraska) | 848.87 mi (1,366.12 km) |
| Boone to On Top of the World Designated Place (Florida) | 492.25 mi (792.19 km) |
| Boone to Onalaska (Wisconsin) | 731.14 mi (1,176.65 km) |
| Boone to Oneida (New York) | 571.57 mi (919.85 km) |
| Boone to Oneonta (New York) | 556.88 mi (896.21 km) |
| Boone to Ontario (California) | 2,024.95 mi (3,258.84 km) |
| Boone to Ontario (Oregon) | 1,925.78 mi (3,099.24 km) |
| Boone to Opa-locka (Florida) | 717.31 mi (1,154.39 km) |
| Boone to Opelika (Alabama) | 323.75 mi (521.03 km) |
| Boone to Opelousas (Louisiana) | 717.29 mi (1,154.37 km) |
| Boone to Orange (California) | 2,041.06 mi (3,284.77 km) |
| Boone to Orange (Texas) | 815.24 mi (1,312.01 km) |
| Boone to Orange City (Florida) | 503.23 mi (809.86 km) |
| Boone to Orangeburg (South Carolina) | 193.21 mi (310.94 km) |
