| Canals to Oswego (Illinois) | 4,410.68 mi (7,098.31 km) |
| Canals to Oswego (New York) | 3,818.28 mi (6,144.93 km) |
| Canals to Otsego (Minnesota) | 4,512.49 mi (7,262.16 km) |
| Canals to Ottawa (Illinois) | 4,443.94 mi (7,151.83 km) |
| Canals to Ottawa (Kansas) | 4,833.58 mi (7,778.90 km) |
| Canals to Ottumwa (Iowa) | 4,615.55 mi (7,428.01 km) |
| Canals to Overland (Missouri) | 4,609.12 mi (7,417.66 km) |
| Canals to Overland Park (Kansas) | 4,796.72 mi (7,719.58 km) |
| Canals to Overlea (Maryland) | 3,936.93 mi (6,335.88 km) |
| Canals to Oviedo (Florida) | 4,533.10 mi (7,295.32 km) |
| Canals to Owasso (Oklahoma) | 4,950.46 mi (7,967.00 km) |
| Canals to Owatonna (Minnesota) | 4,538.49 mi (7,303.99 km) |
| Canals to Owensboro (Kentucky) | 4,492.86 mi (7,230.55 km) |
| Canals to Owings Mills (Maryland) | 3,948.65 mi (6,354.74 km) |
| Canals to Owosso (Michigan) | 4,180.78 mi (6,728.32 km) |
