| Alton to Orangevale (California) | 5,258.18 mi (8,462.22 km) |
| Alton to Orchards (Washington) | 4,895.59 mi (7,878.69 km) |
| Alton to Orcutt (California) | 5,452.63 mi (8,775.17 km) |
| Alton to Oregon (Ohio) | 3,773.22 mi (6,072.41 km) |
| Alton to Oregon (Wisconsin) | 3,945.50 mi (6,349.67 km) |
| Alton to Oregon City (Oregon) | 4,917.07 mi (7,913.26 km) |
| Alton to Orem (Utah) | 4,868.56 mi (7,835.19 km) |
| Alton to Orinda (California) | 5,333.40 mi (8,583.28 km) |
| Alton to Orland Park (Illinois) | 3,947.83 mi (6,353.42 km) |
| Alton to Orlando (Florida) | 4,309.76 mi (6,935.89 km) |
| Alton to Ormond Beach (Florida) | 4,259.27 mi (6,854.63 km) |
| Alton to Oro Valley (Arizona) | 5,273.47 mi (8,486.84 km) |
| Alton to Oroville (California) | 5,221.87 mi (8,403.80 km) |
| Alton to Oshkosh (Wisconsin) | 3,864.32 mi (6,219.02 km) |
| Alton to Oskaloosa (Iowa) | 4,144.50 mi (6,669.93 km) |
