| The Dalles to Orangeburg (South Carolina) | 2,276.42 mi (3,663.54 km) |
| The Dalles to Orangevale (California) | 477.94 mi (769.16 km) |
| The Dalles to Orchards (Washington) | 65.40 mi (105.26 km) |
| The Dalles to Orcutt (California) | 742.87 mi (1,195.53 km) |
| The Dalles to Oregon (Ohio) | 1,889.76 mi (3,041.28 km) |
| The Dalles to Oregon (Wisconsin) | 1,573.47 mi (2,532.25 km) |
| The Dalles to Oregon City (Oregon) | 70.73 mi (113.82 km) |
| The Dalles to Orem (Utah) | 602.98 mi (970.40 km) |
| The Dalles to Orinda (California) | 536.17 mi (862.88 km) |
| The Dalles to Orland Park (Illinois) | 1,677.28 mi (2,699.33 km) |
| The Dalles to Orlando (Florida) | 2,461.45 mi (3,961.31 km) |
| The Dalles to Ormond Beach (Florida) | 2,436.62 mi (3,921.37 km) |
| The Dalles to Oro Valley (Arizona) | 1,061.01 mi (1,707.53 km) |
| The Dalles to Oroville (California) | 422.29 mi (679.61 km) |
| The Dalles to Oshkosh (Wisconsin) | 1,591.53 mi (2,561.32 km) |
