| Appenzell to Olympia Heights (Florida) | 4,921.57 mi (7,920.51 km) |
| Appenzell to Omaha (Nebraska) | 4,806.82 mi (7,735.84 km) |
| Appenzell to On Top of the World Designated Place (Florida) | 4,844.74 mi (7,796.86 km) |
| Appenzell to Onalaska (Wisconsin) | 4,503.78 mi (7,248.14 km) |
| Appenzell to Oneida (New York) | 3,938.19 mi (6,337.90 km) |
| Appenzell to Oneonta (New York) | 3,939.38 mi (6,339.82 km) |
| Appenzell to Ontario (California) | 5,927.43 mi (9,539.27 km) |
| Appenzell to Ontario (Oregon) | 5,332.58 mi (8,581.95 km) |
| Appenzell to Opa-locka (Florida) | 4,909.37 mi (7,900.87 km) |
| Appenzell to Opelika (Alabama) | 4,806.48 mi (7,735.28 km) |
| Appenzell to Opelousas (Louisiana) | 5,189.04 mi (8,350.95 km) |
| Appenzell to Orange (California) | 5,947.80 mi (9,572.05 km) |
| Appenzell to Orange (Texas) | 5,277.76 mi (8,493.73 km) |
| Appenzell to Orange City (Florida) | 4,809.38 mi (7,739.95 km) |
| Appenzell to Orangeburg (South Carolina) | 4,576.48 mi (7,365.13 km) |
