| Duluth to Orangevale (California) | 1,567.17 mi (2,522.11 km) |
| Duluth to Orchards (Washington) | 1,445.41 mi (2,326.16 km) |
| Duluth to Orcutt (California) | 1,678.95 mi (2,702.00 km) |
| Duluth to Oregon (Ohio) | 557.30 mi (896.89 km) |
| Duluth to Oregon (Wisconsin) | 298.14 mi (479.82 km) |
| Duluth to Oregon City (Oregon) | 1,454.28 mi (2,340.44 km) |
| Duluth to Orem (Utah) | 1,073.28 mi (1,727.28 km) |
| Duluth to Orinda (California) | 1,640.43 mi (2,640.01 km) |
| Duluth to Orland Park (Illinois) | 415.07 mi (667.99 km) |
| Duluth to Orlando (Florida) | 1,392.54 mi (2,241.07 km) |
| Duluth to Ormond Beach (Florida) | 1,345.58 mi (2,165.50 km) |
| Duluth to Oro Valley (Arizona) | 1,403.44 mi (2,258.62 km) |
| Duluth to Oroville (California) | 1,555.61 mi (2,503.52 km) |
| Duluth to Oshkosh (Wisconsin) | 257.43 mi (414.30 km) |
| Duluth to Oskaloosa (Iowa) | 379.68 mi (611.04 km) |
