🇲🇽 Mexico

Under the 1917 Constitution, executive power is held by a President who is both head of state and head of government, directly elected for a single six-year term — the sexenio — and barred from re-election for life, a principle that dates from the Revolution. The president is chosen by a simple national plurality, with no run-off and no electoral college, so the winner is whoever leads the popular vote. Deputies serve three-year terms and senators six-year terms; both chambers are elected by a mixed system that combines first-past-the-post districts with closed-list proportional representation. The 500 deputies comprise 300 elected in single-member districts and 200 by proportional representation in five regional constituencies. The 128 senators comprise 96 elected by state — two seats to the leading list and one "first minority" seat to the runner-up in each of the 32 entities — plus 32 by national proportional representation.

Figures from official electoral authorities — see Data & Methodology. Last updated 2026-11-02.