| Alton to Odessa (Texas) | 4,985.94 mi (8,024.09 km) |
| Alton to Ogden (Utah) | 4,827.08 mi (7,768.44 km) |
| Alton to Oildale (California) | 5,376.46 mi (8,652.58 km) |
| Alton to Ojus (Florida) | 4,385.17 mi (7,057.25 km) |
| Alton to Okemos (Michigan) | 3,764.68 mi (6,058.67 km) |
| Alton to Oklahoma City (Oklahoma) | 4,616.36 mi (7,429.31 km) |
| Alton to Okmulgee (Oklahoma) | 4,551.27 mi (7,324.55 km) |
| Alton to Olathe (Kansas) | 4,343.30 mi (6,989.86 km) |
| Alton to Old Jamestown (Missouri) | 4,171.55 mi (6,713.46 km) |
| Alton to Oldsmar (Florida) | 4,387.37 mi (7,060.79 km) |
| Alton to Olean (New York) | 3,555.55 mi (5,722.10 km) |
| Alton to Olive Branch (Mississippi) | 4,342.17 mi (6,988.05 km) |
| Alton to Olivehurst (California) | 5,245.79 mi (8,442.29 km) |
| Alton to Olney (Maryland) | 3,628.38 mi (5,839.31 km) |
| Alton to Olympia (Washington) | 4,828.43 mi (7,770.61 km) |
