| Middle River to Orangevale (California) | 2,380.06 mi (3,830.34 km) |
| Middle River to Orchards (Washington) | 2,355.07 mi (3,790.12 km) |
| Middle River to Orcutt (California) | 2,420.04 mi (3,894.68 km) |
| Middle River to Oregon (Ohio) | 401.06 mi (645.44 km) |
| Middle River to Oregon (Wisconsin) | 717.66 mi (1,154.96 km) |
| Middle River to Oregon City (Oregon) | 2,360.69 mi (3,799.16 km) |
| Middle River to Orem (Utah) | 1,860.62 mi (2,994.38 km) |
| Middle River to Orinda (California) | 2,445.57 mi (3,935.77 km) |
| Middle River to Orland Park (Illinois) | 620.58 mi (998.72 km) |
| Middle River to Orlando (Florida) | 801.52 mi (1,289.92 km) |
| Middle River to Ormond Beach (Florida) | 743.27 mi (1,196.18 km) |
| Middle River to Oro Valley (Arizona) | 1,979.53 mi (3,185.75 km) |
| Middle River to Oroville (California) | 2,383.23 mi (3,835.44 km) |
| Middle River to Oshkosh (Wisconsin) | 703.80 mi (1,132.66 km) |
| Middle River to Oskaloosa (Iowa) | 863.46 mi (1,389.61 km) |
