Turnout: 77.14%
About this election
Argentina's 2023 legislative elections renewed half of the Chamber of Deputies on 22 October, alongside the first round of the presidential election. The result reflected the three-way fracture of the presidential race: the Peronist Unión por la Patria won the most seats, but Javier Milei's La Libertad Avanza surged from almost nothing to become a major congressional force, and the centre-right Juntos por el Cambio fell back into third.
130 of the 257 Chamber seats were renewed by D'Hondt proportional representation across the 24 provincial-level constituencies, with a 3% threshold, for four-year terms. Held on the same day as the presidential first round, the legislative vote tracked the three-way presidential contest, and turnout was 77.14%.
Unión por la Patria won about 37.88% of the national vote and 58 of the 130 seats, La Libertad Avanza roughly 27.88% and 35 seats — an extraordinary debut — and Juntos por el Cambio about 26.12% and 31 seats. Juan Schiaretti's Hacemos por Nuestro País and provincial parties shared the remainder.
The arithmetic left the incoming president Javier Milei with only a small bloc of his own deputies, far from a majority, forcing his government to govern by negotiation and decree and to seek alliances with parts of the former Juntos por el Cambio. The strength of Unión por la Patria in the chamber made it the principal counterweight to the new administration.
Unión por la Patria led in Buenos Aires Province and across the Peronist north, La Libertad Avanza ran strongly throughout the interior and Patagonia, and Juntos por el Cambio's vote was concentrated in the City of Buenos Aires and a few prosperous districts. The map closely mirrored the three-way presidential first round.
Official results from Argentina's Cámara Nacional Electoral / Dirección Nacional Electoral (resultados.gob.ar). Vote shares are national aggregates of valid votes; the map shows the leading list in each province, with the full breakdown on click. Per-province seat allocations are not shown.
Compiled and reviewed by Bartłomiej Paruzel, Election Data Analyst, from official results. See our data methodology.