Argentina Legislative election 2017 — Results

The vote in brief

The 2017 Argentine legislative elections, held on 22 October, were a midterm triumph for President Mauricio Macri. His Cambiemos coalition finished first nationally and led the vote in 13 of the 24 districts — a rare midterm advance for a sitting government — appearing to consolidate his project. The result also marked the return of Cristina Fernández de Kirchner to electoral politics, narrowly defeated in the symbolic Buenos Aires Province Senate race.

The electoral system

Half of the 257-seat Chamber of Deputies — 127 seats in 2017 — is renewed every two years by D'Hondt proportional representation in the 24 provincial-level constituencies, with a 3% district threshold. A third of the Senate is renewed at the same time. Voting is compulsory, and the PASO primaries in August had already pointed to a Cambiemos lead.

The campaign and result

With the economy showing tentative signs of recovery, Macri's Cambiemos was rewarded, winning about 41.75% of the national vote and 61 of the 127 seats. The Peronist vote was fragmented between Cristina Fernández de Kirchner's Unidad Ciudadana, the orthodox Justicialist fronts and other provincial Peronist lists, which together outpolled Cambiemos but, divided, won fewer seats — a combined 54 across the various Peronist labels. Provincial parties and the centrist 1País front shared the rest. Turnout was 76.82%.

What happened next

The victory was the high point of the Macri presidency. Emboldened, the government pursued pension and labour reforms, but within months the 2018 currency crisis and the return to the IMF shattered its momentum, and the apparent realignment of 2017 proved short-lived.

Regional breakdown

Cambiemos led across the City of Buenos Aires, Buenos Aires Province, Córdoba, Santa Fe, Mendoza and Entre Ríos — the country's most populous districts — which is why it led in seats despite the Peronist vote being larger in aggregate. The various Peronist lists held the northern provinces and the Patagonian south, while a number of provinces were carried by entrenched provincial parties.

The concurrent Senate and the Buenos Aires duel

The lower-house vote coincided with a renewal of a third of the Senate, and its emblematic contest was the Buenos Aires Province Senate race. There Cambiemos's Esteban Bullrich, the outgoing education minister, defeated Cristina Fernández de Kirchner's newly formed Unidad Ciudadana by around four points in the October general election — a striking result given that she had narrowly edged the same race in the August PASO primary. For the sitting government to beat a former president in her own heartland captured the sense that Macri's project was consolidating, and Cambiemos added senators across several provinces, though Peronism and its allies retained an overall majority in the upper house.

2017 in the arc of the Macri years

Seen across the electoral cycle, October 2017 was the peak of the Macri experiment. Two years later, in the 2019 election, a reunited Peronism returned to power amid the fallout of the currency crisis; and by the 2021 midterm the pendulum had swung again, with the governing Frente de Todos losing its Senate quorum. The 2017 result is best read as the high-water mark of that pendulum rather than the durable realignment it briefly appeared to be — a reading the Argentina hub lays out across every legislative round since 2017.

Where the data comes from

Official results from Argentina's Cámara Nacional Electoral / Dirección Nacional Electoral (resultados.gob.ar). Because Peronism ran under several competing labels, the map shows the single leading list in each province; the national card groups the lists into blocs. Vote shares are of valid votes; per-province seat allocations are not shown.

Compiled and reviewed from official results by ElectioMap. See our data methodology.