| Gland to Olympia Heights (Florida) | 4,797.96 mi (7,721.58 km) |
| Gland to Omaha (Nebraska) | 4,730.06 mi (7,612.30 km) |
| Gland to On Top of the World Designated Place (Florida) | 4,728.46 mi (7,609.71 km) |
| Gland to Onalaska (Wisconsin) | 4,425.60 mi (7,122.31 km) |
| Gland to Oneida (New York) | 3,839.38 mi (6,178.88 km) |
| Gland to Oneonta (New York) | 3,838.55 mi (6,177.55 km) |
| Gland to Ontario (California) | 5,873.22 mi (9,452.03 km) |
| Gland to Ontario (Oregon) | 5,292.70 mi (8,517.78 km) |
| Gland to Opa-locka (Florida) | 4,785.91 mi (7,702.18 km) |
| Gland to Opelika (Alabama) | 4,699.81 mi (7,563.61 km) |
| Gland to Opelousas (Louisiana) | 5,087.95 mi (8,188.27 km) |
| Gland to Orange (California) | 5,893.63 mi (9,484.88 km) |
| Gland to Orange (Texas) | 5,178.42 mi (8,333.86 km) |
| Gland to Orange City (Florida) | 4,691.60 mi (7,550.40 km) |
| Gland to Orangeburg (South Carolina) | 4,465.47 mi (7,186.48 km) |
