Argentina's October 2025 mid-term legislative elections — renewing half of the Chamber of Deputies and a third of the Senate — provided the first major electoral test for the Milei administration since its December 2023 inauguration. Mid-term elections in Argentina's presidential system are structurally significant: they determine whether the governing coalition can expand its legislative presence toward a working majority or whether it will face increased institutional constraints in the second half of the presidential term. The elections were fought in a context of economic adjustment, declining but still-elevated inflation, and a recovery in real wages that had begun in early 2025.
National results and coalition performance
La Libertad Avanza and its allied candidates achieved their strongest results in large urban centers where economic recovery was most visible and where their 2023 electoral coalition had been built. Buenos Aires City — historically the most economically liberal and reform-oriented electorate in the country — delivered approximately 42% for the ruling coalition, while Córdoba reached 38%. In the province of Buenos Aires, which contains a third of the national electorate, results were more closely contested, with LLA gaining ground in the suburban ring but facing stronger opposition in working-class districts of the conurbano. The opposition, fragmented between traditional Peronism, dissident Kirchnerism, and the center-right Juntos por el Cambio bloc, faced coordination challenges that benefited the ruling party in plurality districts.
Geographic and socioeconomic patterns
The geographic distribution of the ruling coalition's vote reflected a consistent pattern: stronger performance in provinces with lower unemployment and greater exposure to formal sector wage recovery, and weaker results in historically Peronist strongholds of the northern provinces. Formosa and Chaco — provinces with high public employment dependency and persistent poverty — gave LLA 18–20% of votes, well below the national average. Electoral geography research on Argentine voting behavior consistently finds that the Buenos Aires–Córdoba–Santa Fe triangle, which concentrates the bulk of formal private sector employment and higher educational attainment, is the primary determinant of national electoral outcomes. Voter turnout was 73.1%, slightly below the 2023 mid-term average, with higher abstention rates in lower-income districts.
The youth vote and demographic patterns
One of the most analytically significant features of the 2025 results was the continuation of a youth electoral realignment. Post-election survey data and precinct-level analysis of areas with high concentrations of young voters consistently showed LLA at approximately 45% among the 18–29 cohort — the highest of any demographic group. This pattern, first clearly visible in the 2023 presidential elections, challenges prior assumptions about Argentine youth politics, which had been associated with center-left or Kirchnerist leanings since the 2010s. Research attributes the shift to economic frustration with incumbents, digital media ecosystems that amplify libertarian messaging, and the appeal of rupture politics among cohorts that entered the labor market during periods of chronic economic instability.
Legislative implications and electoral data
In the Senate, the Peronist bloc retained its blocking minority despite losses, maintaining the capacity to prevent constitutional reforms and certain legislative initiatives. The Chamber of Deputies results produced a more fragmented lower house, with the ruling coalition making gains but falling short of a majority, preserving the need for negotiated legislative coalitions on major legislation. Electoral data — from precinct-level vote counts to aggregate provincial results — is among the most precisely measured of all social statistics in Argentina, as the electoral authority (DINE) compiles comprehensive digitized records. Analyzing these results alongside socioeconomic indicators allows for systematic study of the determinants of political behavior. Our dashboard on the 2025 elections and our dashboard on the 2023 elections provide interactive access to electoral data at the provincial and district level.
