| Darby to Oakley (California) | 2,470.07 mi (3,975.19 km) |
| Darby to Oakton (Virginia) | 130.21 mi (209.55 km) |
| Darby to Oakville (Missouri) | 811.89 mi (1,306.61 km) |
| Darby to Oatfield (Oregon) | 2,399.17 mi (3,861.09 km) |
| Darby to Ocala (Florida) | 838.78 mi (1,349.89 km) |
| Darby to Ocean Acres (New Jersey) | 53.46 mi (86.03 km) |
| Darby to Ocean City (New Jersey) | 57.15 mi (91.97 km) |
| Darby to Ocean Pines (Maryland) | 106.29 mi (171.06 km) |
| Darby to Ocean Pointe (Hawaii) | 4,915.51 mi (7,910.76 km) |
| Darby to Ocean Springs (Mississippi) | 1,005.67 mi (1,618.47 km) |
| Darby to Oceanside (California) | 2,356.25 mi (3,792.02 km) |
| Darby to Oceanside (New York) | 98.75 mi (158.93 km) |
| Darby to Ocoee (Florida) | 861.00 mi (1,385.65 km) |
| Darby to Oconomowoc (Wisconsin) | 718.15 mi (1,155.75 km) |
| Darby to Odenton (Maryland) | 96.57 mi (155.41 km) |
