| Dartford to Orangevale (California) | 5,279.34 mi (8,496.28 km) |
| Dartford to Orchards (Washington) | 4,912.30 mi (7,905.58 km) |
| Dartford to Orcutt (California) | 5,476.19 mi (8,813.08 km) |
| Dartford to Oregon (Ohio) | 3,811.65 mi (6,134.25 km) |
| Dartford to Oregon (Wisconsin) | 3,980.56 mi (6,406.09 km) |
| Dartford to Oregon City (Oregon) | 4,933.93 mi (7,940.40 km) |
| Dartford to Orem (Utah) | 4,894.31 mi (7,876.63 km) |
| Dartford to Orinda (California) | 5,354.40 mi (8,617.07 km) |
| Dartford to Orland Park (Illinois) | 3,984.41 mi (6,412.29 km) |
| Dartford to Orlando (Florida) | 4,355.98 mi (7,010.27 km) |
| Dartford to Ormond Beach (Florida) | 4,305.23 mi (6,928.60 km) |
| Dartford to Oro Valley (Arizona) | 5,303.80 mi (8,535.64 km) |
| Dartford to Oroville (California) | 5,242.42 mi (8,436.86 km) |
| Dartford to Oshkosh (Wisconsin) | 3,898.99 mi (6,274.82 km) |
| Dartford to Oskaloosa (Iowa) | 4,179.16 mi (6,725.70 km) |
