| Boppard to Odessa (Texas) | 5,337.29 mi (8,589.53 km) |
| Boppard to Ogden (Utah) | 5,139.25 mi (8,270.83 km) |
| Boppard to Oildale (California) | 5,683.75 mi (9,147.11 km) |
| Boppard to Ojus (Florida) | 4,764.81 mi (7,668.23 km) |
| Boppard to Okemos (Michigan) | 4,123.29 mi (6,635.79 km) |
| Boppard to Oklahoma City (Oklahoma) | 4,969.65 mi (7,997.87 km) |
| Boppard to Okmulgee (Oklahoma) | 4,906.65 mi (7,896.49 km) |
| Boppard to Olathe (Kansas) | 4,694.61 mi (7,555.25 km) |
| Boppard to Old Jamestown (Missouri) | 4,529.63 mi (7,289.74 km) |
| Boppard to Oldsmar (Florida) | 4,765.25 mi (7,668.93 km) |
| Boppard to Olean (New York) | 3,922.14 mi (6,312.08 km) |
| Boppard to Olive Branch (Mississippi) | 4,707.00 mi (7,575.19 km) |
| Boppard to Olivehurst (California) | 5,537.90 mi (8,912.39 km) |
| Boppard to Olney (Maryland) | 4,000.53 mi (6,438.23 km) |
| Boppard to Olympia (Washington) | 5,097.03 mi (8,202.87 km) |
