| Sankt Gallen to Olympia Heights (Florida) | 4,917.60 mi (7,914.11 km) |
| Sankt Gallen to Omaha (Nebraska) | 4,801.18 mi (7,726.76 km) |
| Sankt Gallen to On Top of the World Designated Place (Florida) | 4,840.42 mi (7,789.90 km) |
| Sankt Gallen to Onalaska (Wisconsin) | 4,498.18 mi (7,239.12 km) |
| Sankt Gallen to Oneida (New York) | 3,933.20 mi (6,329.88 km) |
| Sankt Gallen to Oneonta (New York) | 3,934.47 mi (6,331.92 km) |
| Sankt Gallen to Ontario (California) | 5,921.31 mi (9,529.42 km) |
| Sankt Gallen to Ontario (Oregon) | 5,326.25 mi (8,571.77 km) |
| Sankt Gallen to Opa-locka (Florida) | 4,905.39 mi (7,894.47 km) |
| Sankt Gallen to Opelika (Alabama) | 4,801.76 mi (7,727.69 km) |
| Sankt Gallen to Opelousas (Louisiana) | 5,184.10 mi (8,343.01 km) |
| Sankt Gallen to Orange (California) | 5,941.67 mi (9,562.20 km) |
| Sankt Gallen to Orange (Texas) | 5,272.76 mi (8,485.69 km) |
| Sankt Gallen to Orange City (Florida) | 4,805.13 mi (7,733.11 km) |
| Sankt Gallen to Orangeburg (South Carolina) | 4,571.94 mi (7,357.82 km) |
