| Altamont to Oswego (Illinois) | 1,705.25 mi (2,744.33 km) |
| Altamont to Oswego (New York) | 2,264.93 mi (3,645.05 km) |
| Altamont to Otsego (Minnesota) | 1,411.72 mi (2,271.94 km) |
| Altamont to Ottawa (Illinois) | 1,685.59 mi (2,712.69 km) |
| Altamont to Ottawa (Kansas) | 1,408.47 mi (2,266.71 km) |
| Altamont to Ottumwa (Iowa) | 1,508.72 mi (2,428.05 km) |
| Altamont to Overland (Missouri) | 1,656.84 mi (2,666.43 km) |
| Altamont to Overland Park (Kansas) | 1,431.77 mi (2,304.21 km) |
| Altamont to Overlea (Maryland) | 2,345.52 mi (3,774.75 km) |
| Altamont to Oviedo (Florida) | 2,438.73 mi (3,924.76 km) |
| Altamont to Owasso (Oklahoma) | 1,438.16 mi (2,314.49 km) |
| Altamont to Owatonna (Minnesota) | 1,435.17 mi (2,309.68 km) |
| Altamont to Owensboro (Kentucky) | 1,844.86 mi (2,969.01 km) |
| Altamont to Owings Mills (Maryland) | 2,330.65 mi (3,750.83 km) |
| Altamont to Owosso (Michigan) | 1,894.57 mi (3,049.01 km) |
