| Delaware to Oak Harbor (Washington) | 2,008.70 mi (3,232.70 km) |
| Delaware to Oak Hills (Oregon) | 2,023.48 mi (3,256.48 km) |
| Delaware to Oak Lawn (Illinois) | 263.14 mi (423.49 km) |
| Delaware to Oak Park (California) | 1,994.04 mi (3,209.09 km) |
| Delaware to Oak Park (Illinois) | 269.33 mi (433.44 km) |
| Delaware to Oak Park (Michigan) | 150.71 mi (242.55 km) |
| Delaware to Oak Ridge (Florida) | 821.56 mi (1,322.18 km) |
| Delaware to Oak Ridge (New Jersey) | 452.33 mi (727.95 km) |
| Delaware to Oak Ridge (Tennessee) | 305.83 mi (492.18 km) |
| Delaware to Oakdale (California) | 2,019.69 mi (3,250.38 km) |
| Delaware to Oakdale (Minnesota) | 597.90 mi (962.23 km) |
| Delaware to Oakland (California) | 2,090.65 mi (3,364.57 km) |
| Delaware to Oakland (New Jersey) | 465.65 mi (749.40 km) |
| Delaware to Oakland Park (Florida) | 989.05 mi (1,591.73 km) |
| Delaware to Oakleaf Plantation (Florida) | 702.44 mi (1,130.46 km) |
