| Waltham to Orangeburg (South Carolina) | 806.88 mi (1,298.55 km) |
| Waltham to Orangevale (California) | 2,598.86 mi (4,182.46 km) |
| Waltham to Orchards (Washington) | 2,513.81 mi (4,045.59 km) |
| Waltham to Orcutt (California) | 2,666.88 mi (4,291.92 km) |
| Waltham to Oregon (Ohio) | 627.22 mi (1,009.42 km) |
| Waltham to Oregon (Wisconsin) | 921.05 mi (1,482.29 km) |
| Waltham to Oregon City (Oregon) | 2,522.49 mi (4,059.56 km) |
| Waltham to Orem (Utah) | 2,083.73 mi (3,353.43 km) |
| Waltham to Orinda (California) | 2,668.30 mi (4,294.21 km) |
| Waltham to Orland Park (Illinois) | 853.72 mi (1,373.93 km) |
| Waltham to Orlando (Florida) | 1,114.71 mi (1,793.95 km) |
| Waltham to Ormond Beach (Florida) | 1,057.96 mi (1,702.63 km) |
| Waltham to Oro Valley (Arizona) | 2,263.87 mi (3,643.34 km) |
| Waltham to Oroville (California) | 2,595.26 mi (4,176.67 km) |
| Waltham to Oshkosh (Wisconsin) | 877.87 mi (1,412.79 km) |
