| Ridge to Olympia (Washington) | 2,479.40 mi (3,990.20 km) |
| Ridge to Olympia Heights (Florida) | 1,132.82 mi (1,823.09 km) |
| Ridge to Omaha (Nebraska) | 1,203.38 mi (1,936.66 km) |
| Ridge to On Top of the World Designated Place (Florida) | 972.34 mi (1,564.83 km) |
| Ridge to Onalaska (Wisconsin) | 955.35 mi (1,537.49 km) |
| Ridge to Oneida (New York) | 207.03 mi (333.18 km) |
| Ridge to Oneonta (New York) | 155.42 mi (250.12 km) |
| Ridge to Ontario (California) | 2,470.48 mi (3,975.86 km) |
| Ridge to Ontario (Oregon) | 2,230.84 mi (3,590.20 km) |
| Ridge to Opa-locka (Florida) | 1,119.62 mi (1,801.86 km) |
| Ridge to Opelika (Alabama) | 894.31 mi (1,439.25 km) |
| Ridge to Opelousas (Louisiana) | 1,289.49 mi (2,075.24 km) |
| Ridge to Orange (California) | 2,488.49 mi (4,004.84 km) |
| Ridge to Orange (Texas) | 1,385.10 mi (2,229.11 km) |
| Ridge to Orange City (Florida) | 953.35 mi (1,534.27 km) |
