| Rosemont to Orangeburg (South Carolina) | 2,270.92 mi (3,654.70 km) |
| Rosemont to Orangevale (California) | 12.11 mi (19.49 km) |
| Rosemont to Orchards (Washington) | 497.06 mi (799.93 km) |
| Rosemont to Orcutt (California) | 259.37 mi (417.42 km) |
| Rosemont to Oregon (Ohio) | 1,999.50 mi (3,217.89 km) |
| Rosemont to Oregon (Wisconsin) | 1,690.10 mi (2,719.95 km) |
| Rosemont to Oregon City (Oregon) | 473.69 mi (762.33 km) |
| Rosemont to Orem (Utah) | 529.07 mi (851.45 km) |
| Rosemont to Orinda (California) | 64.21 mi (103.34 km) |
| Rosemont to Orland Park (Illinois) | 1,772.09 mi (2,851.90 km) |
| Rosemont to Orlando (Florida) | 2,387.28 mi (3,841.95 km) |
| Rosemont to Ormond Beach (Florida) | 2,374.23 mi (3,820.95 km) |
| Rosemont to Oro Valley (Arizona) | 720.44 mi (1,159.43 km) |
| Rosemont to Oroville (California) | 66.73 mi (107.38 km) |
| Rosemont to Oshkosh (Wisconsin) | 1,731.97 mi (2,787.33 km) |
