| Waltham to Odenton (Maryland) | 366.18 mi (589.31 km) |
| Waltham to Odessa (Texas) | 1,847.47 mi (2,973.21 km) |
| Waltham to Ogden (Utah) | 2,078.71 mi (3,345.36 km) |
| Waltham to Oildale (California) | 2,579.25 mi (4,150.90 km) |
| Waltham to Ojus (Florida) | 1,242.81 mi (2,000.10 km) |
| Waltham to Okemos (Michigan) | 670.12 mi (1,078.46 km) |
| Waltham to Oklahoma City (Oklahoma) | 1,483.76 mi (2,387.89 km) |
| Waltham to Okmulgee (Oklahoma) | 1,403.64 mi (2,258.94 km) |
| Waltham to Olathe (Kansas) | 1,255.46 mi (2,020.47 km) |
| Waltham to Old Jamestown (Missouri) | 1,026.03 mi (1,651.24 km) |
| Waltham to Oldsmar (Florida) | 1,179.67 mi (1,898.49 km) |
| Waltham to Olean (New York) | 368.30 mi (592.72 km) |
| Waltham to Olive Branch (Mississippi) | 1,123.80 mi (1,808.58 km) |
| Waltham to Olivehurst (California) | 2,605.54 mi (4,193.21 km) |
| Waltham to Olney (Maryland) | 378.31 mi (608.83 km) |
