| Halstenbek to Olympia Heights (Florida) | 4,811.89 mi (7,743.99 km) |
| Halstenbek to Omaha (Nebraska) | 4,550.21 mi (7,322.85 km) |
| Halstenbek to On Top of the World Designated Place (Florida) | 4,707.38 mi (7,575.80 km) |
| Halstenbek to Onalaska (Wisconsin) | 4,252.79 mi (6,844.21 km) |
| Halstenbek to Oneida (New York) | 3,749.78 mi (6,034.69 km) |
| Halstenbek to Oneonta (New York) | 3,757.29 mi (6,046.78 km) |
| Halstenbek to Ontario (California) | 5,614.28 mi (9,035.31 km) |
| Halstenbek to Ontario (Oregon) | 4,994.93 mi (8,038.56 km) |
| Halstenbek to Opa-locka (Florida) | 4,799.20 mi (7,723.56 km) |
| Halstenbek to Opelika (Alabama) | 4,635.84 mi (7,460.66 km) |
| Halstenbek to Opelousas (Louisiana) | 4,997.63 mi (8,042.90 km) |
| Halstenbek to Orange (California) | 5,634.47 mi (9,067.80 km) |
| Halstenbek to Orange (Texas) | 5,080.36 mi (8,176.04 km) |
| Halstenbek to Orange City (Florida) | 4,677.88 mi (7,528.32 km) |
| Halstenbek to Orangeburg (South Carolina) | 4,422.38 mi (7,117.13 km) |
