| Northdale to Olympia Heights (Florida) | 212.70 mi (342.30 km) |
| Northdale to Omaha (Nebraska) | 1,187.33 mi (1,910.83 km) |
| Northdale to On Top of the World Designated Place (Florida) | 70.61 mi (113.63 km) |
| Northdale to Onalaska (Wisconsin) | 1,191.88 mi (1,918.15 km) |
| Northdale to Oneida (New York) | 1,102.96 mi (1,775.04 km) |
| Northdale to Oneonta (New York) | 1,075.91 mi (1,731.51 km) |
| Northdale to Ontario (California) | 2,105.49 mi (3,388.46 km) |
| Northdale to Ontario (Oregon) | 2,193.24 mi (3,529.68 km) |
| Northdale to Opa-locka (Florida) | 206.83 mi (332.86 km) |
| Northdale to Opelika (Alabama) | 357.63 mi (575.56 km) |
| Northdale to Opelousas (Louisiana) | 599.21 mi (964.33 km) |
| Northdale to Orange (California) | 2,117.47 mi (3,407.74 km) |
| Northdale to Orange (Texas) | 692.00 mi (1,113.66 km) |
| Northdale to Orange City (Florida) | 94.50 mi (152.09 km) |
| Northdale to Orangeburg (South Carolina) | 384.99 mi (619.58 km) |
