| Boppard to Oswego (Illinois) | 4,318.05 mi (6,949.23 km) |
| Boppard to Oswego (New York) | 3,786.34 mi (6,093.52 km) |
| Boppard to Otsego (Minnesota) | 4,332.86 mi (6,973.06 km) |
| Boppard to Ottawa (Illinois) | 4,351.97 mi (7,003.82 km) |
| Boppard to Ottawa (Kansas) | 4,725.20 mi (7,604.47 km) |
| Boppard to Ottumwa (Iowa) | 4,499.96 mi (7,241.99 km) |
| Boppard to Overland (Missouri) | 4,539.87 mi (7,306.22 km) |
| Boppard to Overland Park (Kansas) | 4,689.60 mi (7,547.18 km) |
| Boppard to Overlea (Maryland) | 3,968.31 mi (6,386.37 km) |
| Boppard to Oviedo (Florida) | 4,672.75 mi (7,520.07 km) |
| Boppard to Owasso (Oklahoma) | 4,865.13 mi (7,829.67 km) |
| Boppard to Owatonna (Minnesota) | 4,377.00 mi (7,044.10 km) |
| Boppard to Owensboro (Kentucky) | 4,462.53 mi (7,181.74 km) |
| Boppard to Owings Mills (Maryland) | 3,977.20 mi (6,400.68 km) |
| Boppard to Owosso (Michigan) | 4,100.94 mi (6,599.82 km) |
