do more rivers in the united states flow into the atlantic or pacific ocean?

Atlantic.

Well many flow into the Mississippi River which flows to the Gulf of Mexico, so it would be Atlantic. That's just what I would guess, I'm pretty sure it would be though.

The eastern US has much more rainfall than the west. All of the Middle US drains to the Gulf, which is considered Atlantic Ocean. So unless this is some kind of trick question, the Atlantic receives the bulk of runoff and should have the most rivers.

atlantic

The majority of the continental United States' rivers flow into the Atlantic Ocean. I'm not sure how many rivers exist within Alaska, so I would think that that information could skew the results significantly.

Pull out your map and count on the west coast up north runs in to the pacific be casuse of the divide of northern hemisphere to Southern. Most of the country rivers run into the Gulf of Mexico, but there are a few that run in to the Atlantic as well. I would say Atlantic