U.S. Senators are elected to serve six-year terms. Each state elects two senators, and the Senate has a total of 100 members. The terms are staggered so that approximately one-third of the Senate is up for election every two years, which ensures continuity in governance and prevents the entire Senate from being replaced at once

. This six-year term length is established by the U.S. Constitution (Article I, Section 3), and the staggered terms are divided into three classes to facilitate regular elections without complete turnover