Each state has two U.S. senators, for a total of 100 in the Senate. The number is the same for every state, from California with nearly 40 million residents to Wyoming with fewer than 600,000. That equal count is written into Article I, Section 3 of the Constitution and is one of the hardest rules in the entire document to change.1Congress.gov. U.S. Constitution – Article I Section 3
The Constitutional Rule
Article I, Section 3 gives each state two senators, each with one vote.1Congress.gov. U.S. Constitution – Article I Section 3 Population plays no role. The Senate was not designed to mirror the country’s population; that job belongs to the House. The Senate exists so every state carries equal weight in at least one chamber of Congress.
This is one of the only provisions in the Constitution that is effectively unamendable. Article V, which sets out the amendment process, includes a clause stating that no state can be deprived of its equal vote in the Senate without that state’s own consent.2Congress.gov. Unamendable Subjects In practical terms, changing the two-per-state rule would require the agreement of every state that stood to lose representation. That has never happened, and no serious effort has come close.
Why the Framers Settled on Two
The number traces to the Constitutional Convention of 1787. Delegates from large states wanted Congress apportioned by population. Delegates from small states wanted every state to count the same. The deadlock broke with the Connecticut Compromise, which put population-based representation in the House and equal representation in the Senate.3Congress.gov. ArtI.S1.3.4 Bicameralism Without that bargain, the Constitution likely would not have been ratified.
What Two Senators Actually Do
The equal count matters because the Senate holds powers the House does not share. Two senators from a small state carry the same weight in these votes as two senators from the largest state.
Presidential appointments run through the Senate. Under Article II, Section 2, ambassadors, federal judges, Supreme Court justices, cabinet secretaries, and other senior officials take office only with the Senate’s advice and consent, on a simple majority vote.4Congress.gov. Overview of Appointments ClauseAbout Executive Nominations
Treaties take a supermajority. The president negotiates them, but they do not take effect unless two-thirds of the senators present vote to approve.5U.S. Senate. About Treaties That threshold gives small states real leverage over foreign policy.
Impeachment trials happen in the Senate. When the House impeaches a federal official, the Senate tries the case, and conviction requires a two-thirds vote of the members present. When the president is on trial, the Chief Justice of the Supreme Court presides.6Legal Information Institute. The Power to Try Impeachments Overview
The Vice President serves as President of the Senate but has no regular vote. The only time the Vice President votes is to break a tie among the 100 senators.7U.S. Senate. Votes to Break Ties in the Senate With an even number of members, 50-50 splits are common enough that this power can decide close questions.
Six-Year Terms and How the 100 Seats Turn Over
Senators serve six-year terms, three times longer than House terms.8Constitution Annotated. U.S. Constitution – Seventeenth Amendment The Constitution splits all 100 seats into three classes so that roughly a third of the Senate stands for election every two years.9Legal Information Institute. Staggered Senate Elections The chamber is never up for election all at once. The two senators from any given state are always in different classes, so a state never votes for both of its senators in the same cycle.
Class II, with 33 seats, is up in November 2026. Class III follows in 2028 and Class I in 2030.10U.S. Senate. Class II – Senators Whose Terms of Service Expire State legislatures originally chose senators; the 17th Amendment, ratified in 1913, moved that choice to voters through direct popular election.8Constitution Annotated. U.S. Constitution – Seventeenth Amendment
Who Does Not Get Senators
The two-per-state rule applies only to states. The District of Columbia has no voting representation in the Senate. Its residents elect two “shadow senators” who lobby Congress for statehood, but those individuals hold no official seats and cannot vote on legislation.11statehood.dc.gov. DC Governance
U.S. territories also have zero senators. Puerto Rico, Guam, the U.S. Virgin Islands, American Samoa, and the Northern Mariana Islands sit outside the constitutional framework for Senate representation because they are not states. Their residents are U.S. citizens, except in American Samoa, where they are U.S. nationals. Gaining senators would require statehood, which only Congress can grant.