| Waltham to Oskaloosa (Iowa) | 1,101.15 mi (1,772.13 km) |
| Waltham to Oswego (Illinois) | 877.13 mi (1,411.61 km) |
| Waltham to Oswego (New York) | 275.94 mi (444.08 km) |
| Waltham to Otsego (Minnesota) | 1,129.21 mi (1,817.29 km) |
| Waltham to Ottawa (Illinois) | 905.86 mi (1,457.84 km) |
| Waltham to Ottawa (Kansas) | 1,284.46 mi (2,067.14 km) |
| Waltham to Ottumwa (Iowa) | 1,093.61 mi (1,759.99 km) |
| Waltham to Overland (Missouri) | 1,033.69 mi (1,663.56 km) |
| Waltham to Overland Park (Kansas) | 1,248.61 mi (2,009.44 km) |
| Waltham to Overlea (Maryland) | 345.75 mi (556.44 km) |
| Waltham to Oviedo (Florida) | 1,099.43 mi (1,769.36 km) |
| Waltham to Owasso (Oklahoma) | 1,374.25 mi (2,211.64 km) |
| Waltham to Owatonna (Minnesota) | 1,109.68 mi (1,785.85 km) |
| Waltham to Owensboro (Kentucky) | 896.55 mi (1,442.86 km) |
| Waltham to Owings Mills (Maryland) | 355.26 mi (571.74 km) |
