| Dorchester to Orangevale (California) | 5,235.09 mi (8,425.07 km) |
| Dorchester to Orchards (Washington) | 4,878.37 mi (7,850.98 km) |
| Dorchester to Orcutt (California) | 5,426.39 mi (8,732.93 km) |
| Dorchester to Oregon (Ohio) | 3,727.73 mi (5,999.20 km) |
| Dorchester to Oregon (Wisconsin) | 3,904.50 mi (6,283.68 km) |
| Dorchester to Oregon City (Oregon) | 4,899.65 mi (7,885.22 km) |
| Dorchester to Orem (Utah) | 4,839.61 mi (7,788.60 km) |
| Dorchester to Orinda (California) | 5,310.52 mi (8,546.46 km) |
| Dorchester to Orland Park (Illinois) | 3,904.79 mi (6,284.15 km) |
| Dorchester to Orlando (Florida) | 4,253.54 mi (6,845.41 km) |
| Dorchester to Ormond Beach (Florida) | 4,203.41 mi (6,764.73 km) |
| Dorchester to Oro Valley (Arizona) | 5,238.42 mi (8,430.43 km) |
| Dorchester to Oroville (California) | 5,199.60 mi (8,367.95 km) |
| Dorchester to Oshkosh (Wisconsin) | 3,823.84 mi (6,153.88 km) |
| Dorchester to Oskaloosa (Iowa) | 4,103.98 mi (6,604.71 km) |
