There are more than 250,000 rivers in USA. Of which Missouri River is the lengthiest one with 2,540 miles. Mississippi River with 2,340 miles in length comes in 2nd place and the location of its mouth is Louisiana. Right behind is Yukon River, which originates in Alaska, with the length of 1,980 miles. Colorado River which starts its journey in Mexico is 1,450 miles in Length and is in 7th place among the top 10.
Missouri-Mississippi River is also the 4th longest river in the world. The Shortest river in US is D River in Oregon which is merely 120 feet long compared to all other rivers and also the shortest river in the world.