Argentina's 2023 general election was one of the most consequential in recent decades, producing an outcome that surprised most pollsters and reshaped the country's political landscape. The process unfolded in two stages — a first round on October 22 followed by a runoff on November 19 — and the results diverged substantially between the two rounds, revealing a major voter realignment in the weeks between them. The data from both rounds tells a story not just about individual candidates, but about structural shifts in Argentine political preferences that had been building for years.
The October 22 first round: Massa leads, Milei surges
The first round produced an unexpected outcome: Sergio Massa of Unión por la Patria (UxP) led with 36.68% of valid votes — a stronger-than-anticipated result for the ruling coalition's candidate, who was also serving as Economy Minister during a period of triple-digit inflation. Javier Milei of La Libertad Avanza (LLA) placed second with 29.99%, while Patricia Bullrich of Juntos por el Cambio (JxC) finished third with 23.84%. The remaining votes were split among minor candidates. Voter turnout reached 77.7% of the eligible electorate, in line with historical averages for Argentine general elections. The result set up a two-candidate runoff, since no candidate reached the 45% threshold — or 40% with a 10-point lead — required for a first-round victory.
The November 19 runoff: a decisive reversal
The runoff produced a result that inverted the first-round ranking. Javier Milei won with 55.69% of votes against Sergio Massa's 44.30% — a margin of 11.4 percentage points, decisive by any measure. Turnout was marginally lower at 75.7%, suggesting limited abstention-driven protest behavior. The turnaround between rounds was driven primarily by the transfer of Bullrich's voters: exit polls and electoral geography consistently showed that the majority of the 7.8 million voters who had supported Bullrich in October shifted to Milei in November, rather than to Massa or abstaining. This transfer was facilitated by Bullrich's own public endorsement of Milei after the first round.
Geographic patterns: cities, provinces and the spatial divide
The geographic distribution of the runoff result revealed a clear pattern. Milei swept Argentina's economically dynamic provinces by wide margins: he won Buenos Aires City with 62% of the vote, Córdoba with 61%, Mendoza with 59% and Santa Fe with 58%. These four provinces together represent roughly 45% of Argentina's GDP and contain a high share of the urban middle class. Massa, by contrast, held a smaller number of provinces concentrated in the less developed northwest and northeast — winning Formosa, Santiago del Estero and La Rioja, where the ruling coalition's traditional political networks and public employment dependency remained stronger. The contrast underscored a broader urban-rural and center-periphery dimension to the electoral outcome.
Demographic breakdowns: the youth vote and the role of age
Post-election surveys and precinct-level data pointed to pronounced demographic differences in voting behavior. The 18-to-29 age cohort emerged as one of Milei's strongest demographic segments, with multiple surveys placing his support in this group above 60% in the runoff — a striking finding given that younger voters had historically leaned toward center-left options in Argentina. Economic frustration, driven by years of declining real wages, soaring inflation and limited job prospects, appears to have been a key factor mobilizing first-time and young voters behind a candidate running on a radical anti-establishment platform. The inverse was true among voters over 60, who showed stronger support for Massa, reflecting both different economic exposures and different relationships to social security systems that Milei proposed to reform. All the detailed electoral data is available in our dashboard on the 2023 elections.
The 2023 election marked a fundamental restructuring of Argentina's political map. The three-way competition of the primary season gave way to a two-candidate runoff that ended in a decisive victory for a political newcomer who had not held executive office at any level. The scale of the voter transfer between rounds — and its demographic and geographic contours — provides a rich dataset for understanding how economic conditions and political identity interacted to produce one of the most significant electoral outcomes in Argentine history.
