Turnout: 80.37%
About this election
Argentina's 2019 legislative elections renewed half of the Chamber of Deputies on 27 October, alongside the presidential election that returned Peronism to power. The Frente de Todos, the reunited Peronist front behind Alberto Fernández and Cristina Fernández de Kirchner, won the most seats, while the outgoing government's Juntos por el Cambio remained a strong opposition bloc.
130 of the 257 Chamber seats were renewed by D'Hondt proportional representation across the 24 provincial-level constituencies, with a 3% district threshold, for four-year terms. Held on the same day as the presidential vote, the legislative result closely followed the top of the ballot, and turnout was 80.37%.
The Frente de Todos won about 45.26% of the national vote and 64 of the 130 seats at stake, and Juntos por el Cambio 40.36% and 56 seats — a relatively even split that left neither bloc with an outright majority in the full chamber. Roberto Lavagna's Consenso Federal took 5.85% and 3 seats, with provincial parties sharing the remainder.
The new Frente de Todos government took office with a plurality but not a majority in the Chamber, relying on allied provincial blocs to legislate — an arithmetic that, combined with the pandemic and the economic crisis, constrained it throughout the term and contributed to its heavy midterm defeat two years later.
The Frente de Todos led across Buenos Aires Province, the northern provinces and most of the interior, while Juntos por el Cambio held the City of Buenos Aires, Córdoba, Santa Fe, Mendoza and Entre Ríos. The geography was almost identical to the concurrent presidential map.
The lower-house vote coincided with a partial renewal of the Senate, where 24 of the 72 seats were contested. The Frente de Todos won 13 of them and Juntos por el Cambio 8, lifting the Peronist bloc to roughly 39 senators against about 28 for the outgoing government's coalition. Combined with its plurality in the Chamber, this gave the incoming Fernández administration a firmer footing in the upper house than in the lower one, where it leaned on allied provincial deputies. The geography of the legislative vote tracked the presidential result closely: Alberto Fernández carried a large majority of provinces, while Mauricio Macri still won decisively in the City of Buenos Aires (around 53%) even as he lost Buenos Aires Province by well over a million votes.
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.