| Valley to Olympia (Washington) | 2,199.11 mi (3,539.12 km) |
| Valley to Olympia Heights (Florida) | 569.72 mi (916.88 km) |
| Valley to Omaha (Nebraska) | 835.81 mi (1,345.11 km) |
| Valley to On Top of the World Designated Place (Florida) | 307.97 mi (495.64 km) |
| Valley to Onalaska (Wisconsin) | 831.66 mi (1,338.43 km) |
| Valley to Oneida (New York) | 877.54 mi (1,412.26 km) |
| Valley to Oneonta (New York) | 864.99 mi (1,392.06 km) |
| Valley to Ontario (California) | 1,863.98 mi (2,999.79 km) |
| Valley to Ontario (Oregon) | 1,872.45 mi (3,013.41 km) |
| Valley to Opa-locka (Florida) | 561.84 mi (904.19 km) |
| Valley to Opelika (Alabama) | 15.29 mi (24.60 km) |
| Valley to Opelousas (Louisiana) | 435.28 mi (700.51 km) |
| Valley to Orange (California) | 1,878.18 mi (3,022.64 km) |
| Valley to Orange (Texas) | 538.40 mi (866.48 km) |
| Valley to Orange City (Florida) | 353.41 mi (568.75 km) |
