| Darlaston to Olympia Heights (Florida) | 4,344.96 mi (6,992.55 km) |
| Darlaston to Omaha (Nebraska) | 4,183.00 mi (6,731.89 km) |
| Darlaston to On Top of the World Designated Place (Florida) | 4,253.17 mi (6,844.82 km) |
| Darlaston to Onalaska (Wisconsin) | 3,880.05 mi (6,244.33 km) |
| Darlaston to Oneida (New York) | 3,324.74 mi (5,350.65 km) |
| Darlaston to Oneonta (New York) | 3,327.92 mi (5,355.76 km) |
| Darlaston to Ontario (California) | 5,311.02 mi (8,547.27 km) |
| Darlaston to Ontario (Oregon) | 4,727.86 mi (7,608.76 km) |
| Darlaston to Opa-locka (Florida) | 4,332.46 mi (6,972.42 km) |
| Darlaston to Opelika (Alabama) | 4,200.35 mi (6,759.80 km) |
| Darlaston to Opelousas (Louisiana) | 4,576.29 mi (7,364.82 km) |
| Darlaston to Orange (California) | 5,331.42 mi (8,580.10 km) |
| Darlaston to Orange (Texas) | 4,663.34 mi (7,504.92 km) |
| Darlaston to Orange City (Florida) | 4,220.69 mi (6,792.55 km) |
| Darlaston to Orangeburg (South Carolina) | 3,976.73 mi (6,399.92 km) |
