| Leek to Olympia Heights (Florida) | 4,341.02 mi (6,986.20 km) |
| Leek to Omaha (Nebraska) | 4,165.01 mi (6,702.93 km) |
| Leek to On Top of the World Designated Place (Florida) | 4,246.66 mi (6,834.33 km) |
| Leek to Onalaska (Wisconsin) | 3,862.48 mi (6,216.07 km) |
| Leek to Oneida (New York) | 3,313.21 mi (5,332.10 km) |
| Leek to Oneonta (New York) | 3,317.02 mi (5,338.23 km) |
| Leek to Ontario (California) | 5,287.97 mi (8,510.17 km) |
| Leek to Ontario (Oregon) | 4,702.08 mi (7,567.27 km) |
| Leek to Opa-locka (Florida) | 4,328.47 mi (6,966.00 km) |
| Leek to Opelika (Alabama) | 4,190.68 mi (6,744.24 km) |
| Leek to Opelousas (Louisiana) | 4,564.69 mi (7,346.16 km) |
| Leek to Orange (California) | 5,308.36 mi (8,542.98 km) |
| Leek to Orange (Texas) | 4,651.19 mi (7,485.37 km) |
| Leek to Orange City (Florida) | 4,214.73 mi (6,782.95 km) |
| Leek to Orangeburg (South Carolina) | 3,968.62 mi (6,386.88 km) |
