| Amherst to Olympia Heights (Florida) | 1,088.64 mi (1,752.00 km) |
| Amherst to Omaha (Nebraska) | 716.44 mi (1,153.00 km) |
| Amherst to On Top of the World Designated Place (Florida) | 849.60 mi (1,367.31 km) |
| Amherst to Onalaska (Wisconsin) | 487.19 mi (784.05 km) |
| Amherst to Oneida (New York) | 355.22 mi (571.68 km) |
| Amherst to Oneonta (New York) | 375.24 mi (603.88 km) |
| Amherst to Ontario (California) | 1,984.22 mi (3,193.30 km) |
| Amherst to Ontario (Oregon) | 1,760.06 mi (2,832.54 km) |
| Amherst to Opa-locka (Florida) | 1,077.04 mi (1,733.33 km) |
| Amherst to Opelika (Alabama) | 628.26 mi (1,011.09 km) |
| Amherst to Opelousas (Louisiana) | 930.42 mi (1,497.37 km) |
| Amherst to Orange (California) | 2,002.38 mi (3,222.52 km) |
| Amherst to Orange (Texas) | 1,010.62 mi (1,626.43 km) |
| Amherst to Orange City (Florida) | 863.04 mi (1,388.93 km) |
| Amherst to Orangeburg (South Carolina) | 551.56 mi (887.64 km) |
