Top 10 Longest Rivers of USA

10. Ohio River

Length: 1575 Kms. / 979 Mile Starts: Confluence of river Allegheny and Monongahela at Pittsburgh, Pennsylvania. Ends: Mississippi near Cairo, Illinois

9. Snake River

Length: 1674 Kms / 1040 Mile Starts: Rocky Mountains, Western Wyoming Ends: Columbia River at Lake Wallula 

8. Red River of the South

Length – 1811 Kms. / 1125 Miles Starts: Confluence of Rivers at Harmon County, Oklahoma Ends: Atchafalaya River in Louisiana

7. Columbia River

Length – 2000 Kms. / 1243 Miles Starts:  The Rocky Mountains of British Columbia Ends: Pacific Ocean, near Clatsop County

6. Arkansas River

Length – 2322 Kms. / 1443 Miles Starts: The Rocky Mountains in Colorado, near Leadville. Ends: Mississippi, near Napoleon, Desha County

5. Colorado River

Length – 2330 Kms. / 1450 Miles Starts: Central Rocky Mountains of Colorado Ends: Gulf of California

4. River Rio Grande

Length – 2830 Kms. / 1759 Miles Starts: Rockies' San Juan Range, Colorado Ends: Gulf of Mexico

3. Yukon River

Length – 3190 Kms. / 1979 Miles Starts: Mountains of British Columbia, Canada Ends: Bering Sea

2. Mississippi River

2. Mississippi River

Length – 3766 Kms. / 2340 Miles Starts: Lake Itasca in northern Minnesota Ends: Gulf of Mexico

1. Missouri River

Length – 3768 Kms. / 2341 Miles Starts: The Rocky Mountains at southwestern Montana Ends: Mississippi River at St. Louis, Missouri