| Canals to Orangevale (California) | 5,886.42 mi (9,473.28 km) |
| Canals to Orchards (Washington) | 5,572.09 mi (8,967.41 km) |
| Canals to Orcutt (California) | 6,051.80 mi (9,739.44 km) |
| Canals to Oregon (Ohio) | 4,190.04 mi (6,743.22 km) |
| Canals to Oregon (Wisconsin) | 4,414.27 mi (7,104.09 km) |
| Canals to Oregon City (Oregon) | 5,591.94 mi (8,999.35 km) |
| Canals to Orem (Utah) | 5,449.34 mi (8,769.87 km) |
| Canals to Orinda (California) | 5,962.64 mi (9,595.94 km) |
| Canals to Orland Park (Illinois) | 4,392.04 mi (7,068.30 km) |
| Canals to Orlando (Florida) | 4,547.49 mi (7,318.48 km) |
| Canals to Ormond Beach (Florida) | 4,504.96 mi (7,250.03 km) |
| Canals to Oro Valley (Arizona) | 5,788.38 mi (9,315.49 km) |
| Canals to Oroville (California) | 5,857.12 mi (9,426.12 km) |
| Canals to Oshkosh (Wisconsin) | 4,340.77 mi (6,985.79 km) |
| Canals to Oskaloosa (Iowa) | 4,615.24 mi (7,427.52 km) |
