| Middlesex to Oak Harbor (Washington) | 2,392.49 mi (3,850.34 km) |
| Middlesex to Oak Hills (Oregon) | 2,427.10 mi (3,906.05 km) |
| Middlesex to Oak Lawn (Illinois) | 693.28 mi (1,115.73 km) |
| Middlesex to Oak Park (California) | 2,443.96 mi (3,933.18 km) |
| Middlesex to Oak Park (Illinois) | 695.73 mi (1,119.67 km) |
| Middlesex to Oak Park (Michigan) | 467.46 mi (752.31 km) |
| Middlesex to Oak Ridge (Florida) | 923.40 mi (1,486.07 km) |
| Middlesex to Oak Ridge (New Jersey) | 31.64 mi (50.92 km) |
| Middlesex to Oak Ridge (Tennessee) | 618.84 mi (995.93 km) |
| Middlesex to Oakdale (California) | 2,461.57 mi (3,961.51 km) |
| Middlesex to Oakdale (Minnesota) | 982.11 mi (1,580.56 km) |
| Middlesex to Oakland (California) | 2,531.42 mi (4,073.92 km) |
| Middlesex to Oakland (New Jersey) | 34.38 mi (55.33 km) |
| Middlesex to Oakland Park (Florida) | 1,046.15 mi (1,683.62 km) |
| Middlesex to Oakleaf Plantation (Florida) | 828.43 mi (1,333.23 km) |
