| Halen to Olympia Heights (Florida) | 4,666.48 mi (7,509.98 km) |
| Halen to Omaha (Nebraska) | 4,500.57 mi (7,242.97 km) |
| Halen to On Top of the World Designated Place (Florida) | 4,577.61 mi (7,366.95 km) |
| Halen to Onalaska (Wisconsin) | 4,198.57 mi (6,756.95 km) |
| Halen to Oneida (New York) | 3,650.37 mi (5,874.71 km) |
| Halen to Oneonta (New York) | 3,653.74 mi (5,880.12 km) |
| Halen to Ontario (California) | 5,612.35 mi (9,032.20 km) |
| Halen to Ontario (Oregon) | 5,016.15 mi (8,072.72 km) |
| Halen to Opa-locka (Florida) | 4,654.04 mi (7,489.96 km) |
| Halen to Opelika (Alabama) | 4,526.25 mi (7,284.29 km) |
| Halen to Opelousas (Louisiana) | 4,901.91 mi (7,888.87 km) |
| Halen to Orange (California) | 5,632.70 mi (9,064.96 km) |
| Halen to Orange (Texas) | 4,988.72 mi (8,028.56 km) |
| Halen to Orange City (Florida) | 4,544.64 mi (7,313.88 km) |
| Halen to Orangeburg (South Carolina) | 4,302.20 mi (6,923.72 km) |
