| Monroe to Orangevale (California) | 1,683.96 mi (2,710.06 km) |
| Monroe to Orchards (Washington) | 1,853.02 mi (2,982.15 km) |
| Monroe to Orcutt (California) | 1,632.08 mi (2,626.58 km) |
| Monroe to Oregon (Ohio) | 789.86 mi (1,271.16 km) |
| Monroe to Oregon (Wisconsin) | 733.78 mi (1,180.91 km) |
| Monroe to Oregon City (Oregon) | 1,848.31 mi (2,974.58 km) |
| Monroe to Orem (Utah) | 1,212.65 mi (1,951.57 km) |
| Monroe to Orinda (California) | 1,731.46 mi (2,786.51 km) |
| Monroe to Orland Park (Illinois) | 669.38 mi (1,077.27 km) |
| Monroe to Orlando (Florida) | 697.26 mi (1,122.13 km) |
| Monroe to Ormond Beach (Florida) | 687.24 mi (1,106.00 km) |
| Monroe to Oro Valley (Arizona) | 1,100.26 mi (1,770.69 km) |
| Monroe to Oroville (California) | 1,708.47 mi (2,749.52 km) |
| Monroe to Oshkosh (Wisconsin) | 817.20 mi (1,315.16 km) |
| Monroe to Oskaloosa (Iowa) | 607.00 mi (976.87 km) |
