| Morris to Olympia Heights (Florida) | 1,176.10 mi (1,892.75 km) |
| Morris to Omaha (Nebraska) | 395.50 mi (636.49 km) |
| Morris to On Top of the World Designated Place (Florida) | 915.22 mi (1,472.91 km) |
| Morris to Onalaska (Wisconsin) | 223.77 mi (360.12 km) |
| Morris to Oneida (New York) | 663.08 mi (1,067.13 km) |
| Morris to Oneonta (New York) | 690.41 mi (1,111.11 km) |
| Morris to Ontario (California) | 1,664.29 mi (2,678.42 km) |
| Morris to Ontario (Oregon) | 1,453.62 mi (2,339.37 km) |
| Morris to Opa-locka (Florida) | 1,166.69 mi (1,877.60 km) |
| Morris to Opelika (Alabama) | 625.06 mi (1,005.94 km) |
| Morris to Opelousas (Louisiana) | 776.75 mi (1,250.06 km) |
| Morris to Orange (California) | 1,682.61 mi (2,707.90 km) |
| Morris to Orange (Texas) | 832.48 mi (1,339.75 km) |
| Morris to Orange City (Florida) | 948.64 mi (1,526.68 km) |
| Morris to Orangeburg (South Carolina) | 684.06 mi (1,100.88 km) |
