| Glendale to Olympia Heights (Florida) | 1,981.59 mi (3,189.06 km) |
| Glendale to Omaha (Nebraska) | 1,031.86 mi (1,660.62 km) |
| Glendale to On Top of the World Designated Place (Florida) | 1,787.47 mi (2,876.66 km) |
| Glendale to Onalaska (Wisconsin) | 1,332.46 mi (2,144.39 km) |
| Glendale to Oneida (New York) | 2,069.08 mi (3,329.87 km) |
| Glendale to Oneonta (New York) | 2,095.18 mi (3,371.86 km) |
| Glendale to Ontario (California) | 310.19 mi (499.20 km) |
| Glendale to Ontario (Oregon) | 765.33 mi (1,231.68 km) |
| Glendale to Opa-locka (Florida) | 1,981.56 mi (3,189.01 km) |
| Glendale to Opelika (Alabama) | 1,550.93 mi (2,495.99 km) |
| Glendale to Opelousas (Louisiana) | 1,196.69 mi (1,925.89 km) |
| Glendale to Orange (California) | 321.73 mi (517.78 km) |
| Glendale to Orange (Texas) | 1,108.38 mi (1,783.77 km) |
| Glendale to Orange City (Florida) | 1,848.53 mi (2,974.92 km) |
| Glendale to Orangeburg (South Carolina) | 1,799.30 mi (2,895.70 km) |
