| Altamont to Orangevale (California) | 243.95 mi (392.60 km) |
| Altamont to Orchards (Washington) | 244.51 mi (393.50 km) |
| Altamont to Orcutt (California) | 511.23 mi (822.74 km) |
| Altamont to Oregon (Ohio) | 1,952.11 mi (3,141.62 km) |
| Altamont to Oregon (Wisconsin) | 1,636.17 mi (2,633.16 km) |
| Altamont to Oregon City (Oregon) | 221.48 mi (356.44 km) |
| Altamont to Orem (Utah) | 536.74 mi (863.80 km) |
| Altamont to Orinda (California) | 299.25 mi (481.60 km) |
| Altamont to Orland Park (Illinois) | 1,730.34 mi (2,784.72 km) |
| Altamont to Orlando (Florida) | 2,438.09 mi (3,923.73 km) |
| Altamont to Ormond Beach (Florida) | 2,418.86 mi (3,892.78 km) |
| Altamont to Oro Valley (Arizona) | 895.84 mi (1,441.72 km) |
| Altamont to Oroville (California) | 186.61 mi (300.32 km) |
| Altamont to Oshkosh (Wisconsin) | 1,666.20 mi (2,681.49 km) |
| Altamont to Oskaloosa (Iowa) | 1,493.37 mi (2,403.35 km) |
