30 Anonymous In: Question-Answer What is the longest river in the U.S.? 30 What is the longest river in the U.S.? Mississippi River Rio Grande Colorado River Missouri River 1 Answer Voted Oldest Recent Random Best Answer Goto 2021-08-31T02:50:51+00:00Added an answer on August 31, 2021 at 2:50 am The correct answer is: Missouri River. 15 Reply Share Share Share on Facebook Share on Twitter Share on WhatsApp Leave an answerLeave an answerCancel reply Featured image Select file Browse Click on image to update the captcha. Save my name, email, and website in this browser for the next time I comment.