| Alton to Oakley (California) | 5,312.39 mi (8,549.47 km) |
| Alton to Oakton (Virginia) | 3,649.29 mi (5,872.97 km) |
| Alton to Oakville (Missouri) | 4,191.68 mi (6,745.85 km) |
| Alton to Oatfield (Oregon) | 4,913.08 mi (7,906.84 km) |
| Alton to Ocala (Florida) | 4,309.57 mi (6,935.58 km) |
| Alton to Ocean Acres (New Jersey) | 3,487.10 mi (5,611.95 km) |
| Alton to Ocean City (New Jersey) | 3,521.08 mi (5,666.63 km) |
| Alton to Ocean Pines (Maryland) | 3,582.61 mi (5,765.66 km) |
| Alton to Ocean Pointe (Hawaii) | 7,239.36 mi (11,650.63 km) |
| Alton to Ocean Springs (Mississippi) | 4,524.84 mi (7,282.03 km) |
| Alton to Oceanside (California) | 5,445.66 mi (8,763.94 km) |
| Alton to Oceanside (New York) | 3,422.24 mi (5,507.57 km) |
| Alton to Ocoee (Florida) | 4,313.01 mi (6,941.13 km) |
| Alton to Oconomowoc (Wisconsin) | 3,903.67 mi (6,282.36 km) |
| Alton to Odenton (Maryland) | 3,616.40 mi (5,820.03 km) |
