| Ii to Olympia Heights (Florida) | 5,043.26 mi (8,116.34 km) |
| Ii to Omaha (Nebraska) | 4,434.23 mi (7,136.20 km) |
| Ii to On Top of the World Designated Place (Florida) | 4,881.61 mi (7,856.20 km) |
| Ii to Onalaska (Wisconsin) | 4,167.28 mi (6,706.60 km) |
| Ii to Oneida (New York) | 3,854.88 mi (6,203.83 km) |
| Ii to Oneonta (New York) | 3,877.25 mi (6,239.83 km) |
| Ii to Ontario (California) | 5,290.19 mi (8,513.73 km) |
| Ii to Ontario (Oregon) | 4,616.26 mi (7,429.15 km) |
| Ii to Opa-locka (Florida) | 5,030.06 mi (8,095.09 km) |
| Ii to Opelika (Alabama) | 4,735.84 mi (7,621.60 km) |
| Ii to Opelousas (Louisiana) | 5,030.18 mi (8,095.29 km) |
| Ii to Orange (California) | 5,309.09 mi (8,544.16 km) |
| Ii to Orange (Texas) | 5,094.31 mi (8,198.50 km) |
| Ii to Orange City (Florida) | 4,866.79 mi (7,832.34 km) |
| Ii to Orangeburg (South Carolina) | 4,571.92 mi (7,357.80 km) |
