| Dorchester to Oakley (California) | 5,289.21 mi (8,512.16 km) |
| Dorchester to Oakton (Virginia) | 3,598.13 mi (5,790.63 km) |
| Dorchester to Oakville (Missouri) | 4,147.43 mi (6,674.65 km) |
| Dorchester to Oatfield (Oregon) | 4,895.71 mi (7,878.88 km) |
| Dorchester to Ocala (Florida) | 4,254.19 mi (6,846.46 km) |
| Dorchester to Ocean Acres (New Jersey) | 3,435.08 mi (5,528.23 km) |
| Dorchester to Ocean City (New Jersey) | 3,468.82 mi (5,582.53 km) |
| Dorchester to Ocean Pines (Maryland) | 3,529.92 mi (5,680.86 km) |
| Dorchester to Ocean Pointe (Hawaii) | 7,242.44 mi (11,655.58 km) |
| Dorchester to Ocean Springs (Mississippi) | 4,473.91 mi (7,200.07 km) |
| Dorchester to Oceanside (California) | 5,415.90 mi (8,716.05 km) |
| Dorchester to Oceanside (New York) | 3,370.66 mi (5,424.55 km) |
| Dorchester to Ocoee (Florida) | 4,256.95 mi (6,850.90 km) |
| Dorchester to Oconomowoc (Wisconsin) | 3,862.31 mi (6,215.79 km) |
| Dorchester to Odenton (Maryland) | 3,565.06 mi (5,737.41 km) |
