| Darton to Olympia Heights (Florida) | 4,356.81 mi (7,011.62 km) |
| Darton to Omaha (Nebraska) | 4,165.84 mi (6,704.27 km) |
| Darton to On Top of the World Designated Place (Florida) | 4,259.95 mi (6,855.73 km) |
| Darton to Onalaska (Wisconsin) | 3,863.86 mi (6,218.29 km) |
| Darton to Oneida (New York) | 3,321.46 mi (5,345.37 km) |
| Darton to Oneonta (New York) | 3,325.94 mi (5,352.58 km) |
| Darton to Ontario (California) | 5,282.36 mi (8,501.13 km) |
| Darton to Ontario (Oregon) | 4,692.81 mi (7,552.35 km) |
| Darton to Opa-locka (Florida) | 4,344.22 mi (6,991.35 km) |
| Darton to Opelika (Alabama) | 4,200.77 mi (6,760.49 km) |
| Darton to Opelousas (Louisiana) | 4,572.70 mi (7,359.05 km) |
| Darton to Orange (California) | 5,302.74 mi (8,533.93 km) |
| Darton to Orange (Texas) | 4,658.60 mi (7,497.29 km) |
| Darton to Orange City (Florida) | 4,228.57 mi (6,805.23 km) |
| Darton to Orangeburg (South Carolina) | 3,980.35 mi (6,405.76 km) |
