Argentina · Buenos Aires
Buenos Aires — Senate renewal
All 24 provincial jurisdictions are screened; 3,440 current provincial/local or shared-ballot units are registered. Recovered archives now cover all provinces. All 804 previously inaccessible Córdoba tribunal tables are restored, adding local histories and replacing provincial secondary vote transcriptions. Several local tiers have inventories or winner-only evidence without three full returns. Corrientes and Santiago del Estero executive cycles outside the window are excluded. Partial chamber renewals, Santa Fe commune reform, conventions and replacements remain distinct. Older local votes, selected certificates and 2027 office calls remain incomplete. Ten 2023 Catamarca local returns are recovered from DINE provisional table data through exact single-municipality department bridges; they remain excluded from complete-cycle metrics pending final-tally reconciliation.
Historical competition
Competitiveness index for a verified actual-event sequence withheld. Actual-event and/or comparability review incomplete.
Current government and control: Unverified. Local government-risk forecast: unassessed.
National polling context: National presidential approval; context for subnational races — AtlasIntel / Bloomberg; fieldwork 2026-07-30 to 2026-08-03. Sample 1,120; reported margin of error ±3.00 percentage points. Earlier comparison wave; named officeholder and question wording retained. Poll report
National polling context: National presidential approval; context for subnational races — AtlasIntel / Bloomberg; fieldwork 2026-08-30 to 2026-09-03. Sample 2,193; reported margin of error ±2.00 percentage points. Approval rose 1.0 percentage point while disapproval fell 4.4 points; approval movement is smaller than the combined reported survey uncertainty. The negative approval balance remains a national headwind for Milei-aligned candidates, conditional on local alliance and incumbent identity. Poll report
Half-chamber renewal; different electoral sections vote in alternating years. Votes and contested seats do not describe an election of the whole chamber. Current membership/control and the 2027 call remain unverified.
Registry and evidence links: Source 1, Source 2, Source 3, Source 4, Source 5
Electoral event evidence
Separate source records can belong to the same election cycle. Recounts, runoffs and void returns do not create additional cycles.
2025-09-07 · Provincial chamber renewal
Coverage: Certified election-board return; extracted votes and contested seats reconciled
Basis: Votes across the sections voting for this chamber in this renewal. Seats are newly elected seats, not the full chamber. Alternating section electorates preclude ordinary same-electorate CI.
| Party or list | Candidate | Votes or marks | Vote share | Seats |
|---|---|---|---|---|
| ALIANZA FUERZA PATRIA | 1,796,073 | 44.95% | 13 | |
| ALIANZA LA LIBERTAD AVANZA | 1,482,513 | 37.11% | 8 | |
| ALIANZA SOMOS BUENOS AIRES | 280,012 | 7.01% | 2 | |
| FTE. DE IZQUIERDA Y DE TRABAJADORES - UNIDAD | 144,761 | 3.62% | 0 | |
| ALIANZA POTENCIA | 60,177 | 1.51% | 0 | |
| ALIANZA UNION Y LIBERTAD | 50,808 | 1.27% | 0 | |
| ALIANZA UNION LIBERAL | 29,841 | 0.75% | 0 | |
| PARTIDO LIBERTARIO | 24,956 | 0.62% | 0 | |
| PARTIDO POLITICA OBRERA | 21,561 | 0.54% | 0 | |
| ALIANZA ES CON VOS ES CON NOSOTROS | 20,152 | 0.50% | 0 | |
| VALORES REPUBLICANOS | 18,093 | 0.45% | 0 | |
| MOVIMIENTO AVANZADA SOCIALISTA | 17,604 | 0.44% | 0 | |
| CONSTRUYENDO PORVENIR | 16,819 | 0.42% | 0 | |
| PARTIDO FRENTE PATRIOTA FEDERAL | 14,927 | 0.37% | 0 | |
| PARTIDO TIEMPO DE TODOS | 11,651 | 0.29% | 0 | |
| ALIANZA NUEVOS AIRES | 5,428 | 0.14% | 0 |
Result source · PDF pages 5, 6, 77, 78, 98, 99, 153
2023-10-22 · Provincial chamber renewal
Coverage: Certified election-board return; extracted votes and contested seats reconciled
Basis: Votes across the sections voting for this chamber in this renewal. Seats are newly elected seats, not the full chamber. Alternating section electorates preclude ordinary same-electorate CI.
| Party or list | Candidate | Votes or marks | Vote share | Seats |
|---|---|---|---|---|
| UNION POR LA PATRIA | 2,250,753 | 47.49% | 11 | |
| JUNTOS POR EL CAMBIO | 1,155,295 | 24.38% | 7 | |
| LA LIBERTAD AVANZA | 1,132,641 | 23.90% | 5 | |
| FRENTE DE IZQUIERDA Y TRABAJADORES UNIDAD | 200,547 | 4.23% | 0 |
Result source · PDF pages 1, 29, 45, 46, 116
2021-11-14 · Provincial chamber renewal
Coverage: Certified election-board return; extracted votes and contested seats reconciled
Basis: Votes across the sections voting for this chamber in this renewal. Seats are newly elected seats, not the full chamber. Alternating section electorates preclude ordinary same-electorate CI.
| Party or list | Candidate | Votes or marks | Vote share | Seats |
|---|---|---|---|---|
| ALIANZA JUNTOS | 1,934,578 | 42.62% | 13 | |
| FRENTE DE TODOS | 1,681,403 | 37.04% | 10 | |
| ALIANZA AVANZA LIBERTAD | 339,937 | 7.49% | 0 | |
| FRENTE DE IZQUIERDA Y DE TRABAJADORES - | 287,116 | 6.33% | 0 | |
| FRENTE VAMOS CON VOS | 197,875 | 4.36% | 0 | |
| PARTIDO UNION CELESTE Y BLANCO | 98,038 | 2.16% | 0 |
Result source · PDF pages 3, 4, 67, 87, 139
2019-10-27 · Provincial chamber renewal
Coverage: Certified election-board return; extracted votes and contested seats reconciled
Basis: Votes across the sections voting for this chamber in this renewal. Seats are newly elected seats, not the full chamber. Alternating section electorates preclude ordinary same-electorate CI.
| Party or list | Candidate | Votes or marks | Vote share | Seats |
|---|---|---|---|---|
| FRENTE DE TODOS | 2,717,387 | 55.06% | 13 | |
| JUNTOS POR EL CAMBIO | 1,711,369 | 34.67% | 10 | |
| CONSENSO FEDERAL | 261,365 | 5.30% | 0 | |
| FTE DE IZQ. Y DE TRABAJADORES-UNIDAD | 170,616 | 3.46% | 0 | |
| FRENTE NOS | 75,009 | 1.52% | 0 |
Result source · PDF pages 1, 29, 45, 46, 116
2015-10-25 · Provincial chamber renewal
Coverage: Certified election-board return; extracted votes and contested seats reconciled
Basis: Votes across the sections voting for this chamber in this renewal. Seats are newly elected seats, not the full chamber. Alternating section electorates preclude ordinary same-electorate CI.
| Party or list | Candidate | Votes or marks | Vote share | Seats |
|---|---|---|---|---|
| ALIANZA FRENTE PARA LA VICTORIA | 1,729,625 | 39.10% | 8 | |
| ALIANZA CAMBIEMOS BUENOS AIRES | 1,516,089 | 34.27% | 13 | |
| ALIANZA UNIDOS POR UNA NUEVA ALTERNATIVA | 824,993 | 18.65% | 2 | |
| AZA. FTE. DE IZQUIERDA Y LOS TRABAJADORES | 201,871 | 4.56% | 0 | |
| ALIANZA PROGRESISTAS | 141,817 | 3.21% | 0 | |
| PATRIA GRANDE | 9,585 | 0.22% | 0 |
Result source · PDF pages 1, 29, 45, 46, 116
Snapshot 13 September 2026. Fixed election window 8 September 2026 to 8 March 2028. Record AR-PBA-S.