| Morristown to Olympia Heights (Florida) | 744.95 mi (1,198.88 km) |
| Morristown to Omaha (Nebraska) | 770.02 mi (1,239.22 km) |
| Morristown to On Top of the World Designated Place (Florida) | 493.98 mi (794.98 km) |
| Morristown to Onalaska (Wisconsin) | 675.18 mi (1,086.59 km) |
| Morristown to Oneida (New York) | 624.44 mi (1,004.94 km) |
| Morristown to Oneonta (New York) | 615.99 mi (991.34 km) |
| Morristown to Ontario (California) | 1,934.47 mi (3,113.23 km) |
| Morristown to Ontario (Oregon) | 1,845.13 mi (2,969.45 km) |
| Morristown to Opa-locka (Florida) | 734.31 mi (1,181.76 km) |
| Morristown to Opelika (Alabama) | 271.89 mi (437.57 km) |
| Morristown to Opelousas (Louisiana) | 640.41 mi (1,030.63 km) |
| Morristown to Orange (California) | 1,950.52 mi (3,139.05 km) |
| Morristown to Orange (Texas) | 735.90 mi (1,184.31 km) |
| Morristown to Orange City (Florida) | 515.72 mi (829.96 km) |
| Morristown to Orangeburg (South Carolina) | 232.64 mi (374.40 km) |
