| Glassmanor to Olympia Heights (Florida) | 925.51 mi (1,489.46 km) |
| Glassmanor to Omaha (Nebraska) | 1,020.62 mi (1,642.54 km) |
| Glassmanor to On Top of the World Designated Place (Florida) | 736.30 mi (1,184.96 km) |
| Glassmanor to Onalaska (Wisconsin) | 815.21 mi (1,311.96 km) |
| Glassmanor to Oneida (New York) | 302.21 mi (486.36 km) |
| Glassmanor to Oneonta (New York) | 270.62 mi (435.52 km) |
| Glassmanor to Ontario (California) | 2,263.60 mi (3,642.91 km) |
| Glassmanor to Ontario (Oregon) | 2,082.08 mi (3,350.78 km) |
| Glassmanor to Opa-locka (Florida) | 912.58 mi (1,468.66 km) |
| Glassmanor to Opelika (Alabama) | 633.93 mi (1,020.21 km) |
| Glassmanor to Opelousas (Louisiana) | 1,029.50 mi (1,656.82 km) |
| Glassmanor to Orange (California) | 2,280.87 mi (3,670.71 km) |
| Glassmanor to Orange (Texas) | 1,126.02 mi (1,812.16 km) |
| Glassmanor to Orange City (Florida) | 725.90 mi (1,168.22 km) |
| Glassmanor to Orangeburg (South Carolina) | 426.89 mi (687.01 km) |
