| Glassboro to Olympia Heights (Florida) | 1,011.91 mi (1,628.52 km) |
| Glassboro to Omaha (Nebraska) | 1,103.12 mi (1,775.30 km) |
| Glassboro to On Top of the World Designated Place (Florida) | 837.88 mi (1,348.44 km) |
| Glassboro to Onalaska (Wisconsin) | 876.42 mi (1,410.46 km) |
| Glassboro to Oneida (New York) | 234.96 mi (378.14 km) |
| Glassboro to Oneonta (New York) | 190.28 mi (306.22 km) |
| Glassboro to Ontario (California) | 2,358.92 mi (3,796.31 km) |
| Glassboro to Ontario (Oregon) | 2,151.37 mi (3,462.29 km) |
| Glassboro to Opa-locka (Florida) | 998.81 mi (1,607.43 km) |
| Glassboro to Opelika (Alabama) | 750.33 mi (1,207.53 km) |
| Glassboro to Opelousas (Louisiana) | 1,146.65 mi (1,845.36 km) |
| Glassboro to Orange (California) | 2,376.53 mi (3,824.65 km) |
| Glassboro to Orange (Texas) | 1,242.93 mi (2,000.30 km) |
| Glassboro to Orange City (Florida) | 822.63 mi (1,323.89 km) |
| Glassboro to Orangeburg (South Carolina) | 534.47 mi (860.15 km) |
