| Dorchester to Odessa (Texas) | 4,944.47 mi (7,957.36 km) |
| Dorchester to Ogden (Utah) | 4,799.02 mi (7,723.28 km) |
| Dorchester to Oildale (California) | 5,349.50 mi (8,609.19 km) |
| Dorchester to Ojus (Florida) | 4,326.93 mi (6,963.53 km) |
| Dorchester to Okemos (Michigan) | 3,720.68 mi (5,987.85 km) |
| Dorchester to Oklahoma City (Oklahoma) | 4,574.26 mi (7,361.56 km) |
| Dorchester to Okmulgee (Oklahoma) | 4,508.32 mi (7,255.44 km) |
| Dorchester to Olathe (Kansas) | 4,302.11 mi (6,923.58 km) |
| Dorchester to Old Jamestown (Missouri) | 4,127.60 mi (6,642.73 km) |
| Dorchester to Oldsmar (Florida) | 4,331.60 mi (6,971.03 km) |
| Dorchester to Olean (New York) | 3,507.74 mi (5,645.17 km) |
| Dorchester to Olive Branch (Mississippi) | 4,294.99 mi (6,912.13 km) |
| Dorchester to Olivehurst (California) | 5,223.23 mi (8,405.98 km) |
| Dorchester to Olney (Maryland) | 3,577.31 mi (5,757.13 km) |
| Dorchester to Olympia (Washington) | 4,812.46 mi (7,744.90 km) |
