<Table> Longest main - stem rivers of the United States <Tr> <Th> # </Th> <Th> Name </Th> <Th> Mouth </Th> <Th> Length </Th> <Th> Source coordinates </Th> <Th> Mouth coordinates </Th> <Th> Watershed area </Th> <Th> Discharge </Th> <Th> States , provinces , and image </Th> </Tr> <Tr> <Th> </Th> <Td> Missouri River </Td> <Td> Mississippi River </Td> <Td> 7003234100000000000 ♠ 2,341 mi 3,768 km </Td> <Td> 45 ° 55 ′ 39 '' N 111 ° 30 ′ 29 '' W  /  45.92750 ° N 111.50806 ° W  / 45.92750 ; - 111.50806  ( Missouri River ( source ) ) </Td> <Td> 38 ° 48 ′ 49 '' N 90 ° 07 ′ 11 '' W  /  38.81361 ° N 90.11972 ° W  / 38.81361 ; - 90.11972  ( Missouri River ( mouth ) ) </Td> <Td> 7005529353000000000 ♠ 529,353 mi 1,371,017 km </Td> <Td> 7004691000000000000 ♠ 69,100 ft / s 1,956 m / s </Td> <Td> Montana , North Dakota , South Dakota , Nebraska , Iowa , Kansas , Missouri </Td> </Tr> <Tr> <Th> </Th> <Td> Mississippi River </Td> <Td> Gulf of Mexico </Td> <Td> 7003220200000000000 ♠ 2,202 mi 3,544 km </Td> <Td> 47 ° 14 ′ 22 '' N 95 ° 12 ′ 29 '' W  /  47.23944 ° N 95.20806 ° W  / 47.23944 ; - 95.20806  ( Mississippi River ( source ) ) </Td> <Td> 29 ° 09 ′ 04 '' N 89 ° 15 ′ 12 '' W  /  29.15111 ° N 89.25333 ° W  / 29.15111 ; - 89.25333  ( Mississippi River ( mouth ) ) </Td> <Td> 7006126000000000000 ♠ 1,260,000 mi 3,270,000 km </Td> <Td> 7005650000000000000 ♠ 650,000 ft / s 18,400 m / s </Td> <Td> Minnesota , Wisconsin , Iowa , Illinois , Missouri , Kentucky , Tennessee , Arkansas , Mississippi , Louisiana </Td> </Tr> <Tr> <Th> </Th> <Td> Yukon River </Td> <Td> Bering Sea </Td> <Td> 7003197900000000000 ♠ 1,979 mi 3,185 km </Td> <Td> 59 ° 35 ′ 00 '' N 133 ° 47 ′ 00 '' W  /  59.58333 ° N 133.78333 ° W  / 59.58333 ; - 133.78333  ( Yukon River ( source ) ) </Td> <Td> 62 ° 35 ′ 55 '' N 164 ° 48 ′ 00 '' W  /  62.59861 ° N 164.80000 ° W  / 62.59861 ; - 164.80000  ( Yukon River ( mouth ) ) </Td> <Td> 7005324000000000000 ♠ 324,000 mi 839,200 km </Td> <Td> 7005224000000000000 ♠ 224,000 ft / s 6,340 m / s </Td> <Td> British Columbia , Yukon Territory , Alaska </Td> </Tr> <Tr> <Th> </Th> <Td> Rio Grande </Td> <Td> Gulf of Mexico </Td> <Td> 7003175900000000000 ♠ 1,759 mi 2,830 km </Td> <Td> 37 ° 47 ′ 52 '' N 107 ° 32 ′ 18 '' W  /  37.79778 ° N 107.53833 ° W  / 37.79778 ; - 107.53833  ( Rio Grande ( source ) ) </Td> <Td> 25 ° 57 ′ 22 '' N 97 ° 08 ′ 43 '' W  /  25.95611 ° N 97.14528 ° W  / 25.95611 ; - 97.14528  ( Rio Grande ( mouth ) ) </Td> <Td> 7005340000000000000 ♠ 340,000 mi 870,000 km </Td> <Td> 7003130000000000000 ♠ 1,300 ft / s 37 m / s </Td> <Td> Colorado , New Mexico , Texas , Chihuahua , Coahuila , Nuevo León , Tamaulipas </Td> </Tr> <Tr> <Th> 5 </Th> <Td> Colorado River </Td> <Td> Gulf of California </Td> <Td> 7003145000000000000 ♠ 1,450 mi 2,330 km </Td> <Td> 40 ° 28 ′ 20 '' N 105 ° 49 ′ 34 '' W  /  40.47222 ° N 105.82611 ° W  / 40.47222 ; - 105.82611  ( Colorado River ( source ) ) </Td> <Td> 31 ° 48 ′ 57 '' N 114 ° 48 ′ 22 '' W  /  31.81583 ° N 114.80611 ° W  / 31.81583 ; - 114.80611  ( Colorado River ( mouth ) ) </Td> <Td> 7005248000000000000 ♠ 248,000 mi 642,000 km </Td> <Td> 7003140000000000000 ♠ 1,400 ft / s 40 m / s </Td> <Td> Colorado , Utah , Arizona , Nevada , California , Sonora , Baja California </Td> </Tr> <Tr> <Th> 6 </Th> <Td> Arkansas River </Td> <Td> Mississippi River </Td> <Td> 7003144300000000000 ♠ 1,443 mi 2,322 km </Td> <Td> 39 ° 15 ′ 30 '' N 106 ° 20 ′ 38 '' W  /  39.25833 ° N 106.34389 ° W  / 39.25833 ; - 106.34389  ( Arkansas River ( source ) ) </Td> <Td> 33 ° 46 ′ 30 '' N 91 ° 04 ′ 15 '' W  /  33.77500 °