| Moreno Valley to Olympia Heights (Florida) | 2,268.21 mi (3,650.33 km) |
| Moreno Valley to Omaha (Nebraska) | 1,259.84 mi (2,027.51 km) |
| Moreno Valley to On Top of the World Designated Place (Florida) | 2,073.42 mi (3,336.84 km) |
| Moreno Valley to Onalaska (Wisconsin) | 1,549.12 mi (2,493.07 km) |
| Moreno Valley to Oneida (New York) | 2,307.96 mi (3,714.30 km) |
| Moreno Valley to Oneonta (New York) | 2,337.38 mi (3,761.66 km) |
| Moreno Valley to Ontario (California) | 24.36 mi (39.20 km) |
| Moreno Valley to Ontario (Oregon) | 698.05 mi (1,123.41 km) |
| Moreno Valley to Opa-locka (Florida) | 2,268.21 mi (3,650.33 km) |
| Moreno Valley to Opelika (Alabama) | 1,832.88 mi (2,949.73 km) |
| Moreno Valley to Opelousas (Louisiana) | 1,483.29 mi (2,387.12 km) |
| Moreno Valley to Orange (California) | 36.38 mi (58.55 km) |
| Moreno Valley to Orange (Texas) | 1,395.00 mi (2,245.04 km) |
| Moreno Valley to Orange City (Florida) | 2,134.39 mi (3,434.97 km) |
| Moreno Valley to Orangeburg (South Carolina) | 2,077.69 mi (3,343.71 km) |
