| Islington to Olympia Heights (Florida) | 4,437.22 mi (7,141.02 km) |
| Islington to Omaha (Nebraska) | 4,290.41 mi (6,904.75 km) |
| Islington to On Top of the World Designated Place (Florida) | 4,349.24 mi (6,999.43 km) |
| Islington to Onalaska (Wisconsin) | 3,987.23 mi (6,416.82 km) |
| Islington to Oneida (New York) | 3,427.06 mi (5,515.31 km) |
| Islington to Oneonta (New York) | 3,429.57 mi (5,519.35 km) |
| Islington to Ontario (California) | 5,419.86 mi (8,722.42 km) |
| Islington to Ontario (Oregon) | 4,836.19 mi (7,783.09 km) |
| Islington to Opa-locka (Florida) | 4,424.79 mi (7,121.01 km) |
| Islington to Opelika (Alabama) | 4,300.48 mi (6,920.95 km) |
| Islington to Opelousas (Louisiana) | 4,678.53 mi (7,529.36 km) |
| Islington to Orange (California) | 5,440.26 mi (8,755.25 km) |
| Islington to Orange (Texas) | 4,766.14 mi (7,670.37 km) |
| Islington to Orange City (Florida) | 4,315.99 mi (6,945.92 km) |
| Islington to Orangeburg (South Carolina) | 4,074.96 mi (6,558.02 km) |
