| Middle Valley to Olympia Heights (Florida) | 714.73 mi (1,150.25 km) |
| Middle Valley to Omaha (Nebraska) | 722.59 mi (1,162.89 km) |
| Middle Valley to On Top of the World Designated Place (Florida) | 453.31 mi (729.53 km) |
| Middle Valley to Onalaska (Wisconsin) | 680.70 mi (1,095.48 km) |
| Middle Valley to Oneida (New York) | 746.14 mi (1,200.80 km) |
| Middle Valley to Oneonta (New York) | 740.25 mi (1,191.32 km) |
| Middle Valley to Ontario (California) | 1,836.54 mi (2,955.62 km) |
| Middle Valley to Ontario (Oregon) | 1,785.28 mi (2,873.13 km) |
| Middle Valley to Opa-locka (Florida) | 705.60 mi (1,135.55 km) |
| Middle Valley to Opelika (Alabama) | 174.87 mi (281.43 km) |
| Middle Valley to Opelousas (Louisiana) | 513.07 mi (825.71 km) |
| Middle Valley to Orange (California) | 1,852.01 mi (2,980.51 km) |
| Middle Valley to Orange (Texas) | 608.45 mi (979.21 km) |
| Middle Valley to Orange City (Florida) | 488.77 mi (786.60 km) |
| Middle Valley to Orangeburg (South Carolina) | 273.28 mi (439.81 km) |
