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Partial researchResearch snapshot 2026-09-13. Evidence gaps remain; see Coverage for requirements.

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Office briefing

SAN ISIDRO — Municipal council

Tracked current office. Identifiers stay separate from display names.

Costa Rica · SAN ISIDRO / HEREDIA · municipal · Municipal councilCR-C-HEREDIA-SAN-ISIDRO

Read the complete original research briefing

TSE vote books joined to official elected-member declarations where geographic and total checks reconcile. Substitutes retained separately. Subsequent replacements and current officeholder status require review.

1. What office, where, and when is the next election?

Geography
SAN ISIDRO / HEREDIA
Next election
2028-02-06
Linked upcoming event
next-551356f04db1e6ff4428221d
Registry qualification
Unknown

2. How certain is that date?

2028-02-06 is expected (not formally called). Day precision. A date without a formal call is not confirmed.

3. Who won earlier selected elections?

2024-02-04

Ordinary · Legal certification not established · list votes

  • AVANCE ISIDREÑO31.6%
  • UNIDAD SOCIAL CRISTIANA29.7%
  • LIBERACIÓN NACIONAL24.2%
  • LIBERAL PROGRESISTA6.3%
  • ACCIÓN CIUDADANA2.8%
  • FRENTE AMPLIO2.4%
  • NUEVA REPÚBLICA2.2%
  • REPUBLICANO SOCIAL CRISTIANO0.5%
  • NUEVA GENERACIÓN0.3%
Results for event-28d1cb75f0818f58fb40bf67
Label / candidateParty codeVotesShareSeatsStatus
AVANCE ISIDREÑOcosta-rica/Sc1df243471/20242,11431.6%2Recorded
UNIDAD SOCIAL CRISTIANAcosta-rica/Sc1df243471/20241,98929.7%2Recorded
LIBERACIÓN NACIONALcosta-rica/Sc1df243471/20241,62024.2%1Recorded
LIBERAL PROGRESISTAcosta-rica/Sc1df243471/20244256.3%0 (recorded zero)Recorded
ACCIÓN CIUDADANAcosta-rica/Sc1df243471/20241882.8%0 (recorded zero)Recorded
FRENTE AMPLIOcosta-rica/Sc1df243471/20241612.4%0 (recorded zero)Recorded
NUEVA REPÚBLICAcosta-rica/Sc1df243471/20241472.2%0 (recorded zero)Recorded
REPUBLICANO SOCIAL CRISTIANOcosta-rica/Sc1df243471/2024320.5%0 (recorded zero)Recorded
NUEVA GENERACIÓNcosta-rica/Sc1df243471/2024200.3%0 (recorded zero)Recorded

2020-02-02

Ordinary · Legal certification not established · list votes

  • UNIDAD SOCIAL CRISTIANA46.1%
  • LIBERACIÓN NACIONAL23.9%
  • UNIDOS PODEMOS9.1%
  • AVANCE ISIDREÑO8.9%
  • ACCIÓN CIUDADANA7.6%
  • NUEVA REPUBLICA2.9%
  • RESTAURACIÓN NACIONAL1.0%
  • REPUBLICANO SOCIAL CRISTIANO0.4%
Results for event-e6ae7a4abd7dd41733dd9523
Label / candidateParty codeVotesShareSeatsStatus
UNIDAD SOCIAL CRISTIANAcosta-rica/Sfa91292290/20202,74146.1%3Recorded
LIBERACIÓN NACIONALcosta-rica/Sfa91292290/20201,42123.9%2Recorded
UNIDOS PODEMOScosta-rica/Sfa91292290/20205419.1%0 (recorded zero)Recorded
AVANCE ISIDREÑOcosta-rica/Sfa91292290/20205318.9%0 (recorded zero)Recorded
ACCIÓN CIUDADANAcosta-rica/Sfa91292290/20204527.6%0 (recorded zero)Recorded
NUEVA REPUBLICAcosta-rica/Sfa91292290/20201712.9%0 (recorded zero)Recorded
RESTAURACIÓN NACIONALcosta-rica/Sfa91292290/2020591%0 (recorded zero)Recorded
REPUBLICANO SOCIAL CRISTIANOcosta-rica/Sfa91292290/2020240.4%0 (recorded zero)Recorded

2016-02-07

Ordinary · Legal certification not established · list votes

  • UNIDAD SOCIAL CRISTIANA49.0%
  • LIBERACIÓN NACIONAL32.5%
  • ACCIÓN CIUDADANA10.0%
  • FRENTE AMPLIO5.6%
  • MOVIMIENTO LIBERTARIO1.2%
  • REPUBLICANO SOCIAL CRISTIANO1.1%
  • NUEVA GENERACIÓN0.5%
Results for event-92cd5cc2dc3f5bedae47bb89
Label / candidateParty codeVotesShareSeatsStatus
UNIDAD SOCIAL CRISTIANAcosta-rica/S79669f3e5d/20163,25949%2Recorded
LIBERACIÓN NACIONALcosta-rica/S79669f3e5d/20162,16232.5%2Recorded
ACCIÓN CIUDADANAcosta-rica/S79669f3e5d/201666710%1Recorded
FRENTE AMPLIOcosta-rica/S79669f3e5d/20163705.6%0 (recorded zero)Recorded
MOVIMIENTO LIBERTARIOcosta-rica/S79669f3e5d/2016811.2%0 (recorded zero)Recorded
REPUBLICANO SOCIAL CRISTIANOcosta-rica/S79669f3e5d/2016751.1%0 (recorded zero)Recorded
NUEVA GENERACIÓNcosta-rica/S79669f3e5d/2016330.5%0 (recorded zero)Recorded

4. Competition and volatility

competition index

Provisional imported-series CI

52.810–100 historical closeness

Actual-event and/or comparability review incomplete

Comparison status: Provisional imported-series comparison; actual-event review open

Method ci.weighted-gap.v1. Inputs: latest_gap=1.8667861409796913, oldest_gap=16.50368587332631, previous_gap=22.222222222222218

pedersen volatility

Provisional volatility

22.92percentage points

Grouped Pedersen lower bound (percentage points). Twelve explicitly named standalone national parties; accent variants normalized. Local parties and coalitions remain Other. No alliance votes are attributed to individual member parties. An interval is withheld if either election has no list mapped to an explicit named group. This is aggregate share change, not individual voter switching. Event review: Actual-event and/or comparability review incomplete

Comparison status: Latest interval

Method pedersen.grouped.v1. Inputs: groups=["PLN","PUSC","PAC","Frente Amplio","PRN","Nueva Republica","PML","PIN","PASE","PRSC","PLP","PPSD","Other"], interval=Latest interval, vectors=[[24.193548387096776,29.704301075268816,2.807646356033453,2.40442054958184,0,2.195340501792115,0,0,0,0.4778972520908005,6.347072879330944,0,31.869772998805256],[23.922558922558924,46.14478114478114,7.609427609427609,0,0.9932659932659933,2.878787878787879,0,0,0,0.40404040404040403,0,0,18.04713804713805],[32.52595155709343,49.02963743041974,10.034602076124568,5.5664209417782455,0,0,1.218594854821724,0,0,1.128328569279374,0,0,0.49646457048292464]]

pedersen volatility

Provisional volatility

21.42percentage points

Grouped Pedersen lower bound (percentage points). Twelve explicitly named standalone national parties; accent variants normalized. Local parties and coalitions remain Other. No alliance votes are attributed to individual member parties. An interval is withheld if either election has no list mapped to an explicit named group. This is aggregate share change, not individual voter switching. Event review: Actual-event and/or comparability review incomplete

Comparison status: Previous interval

Method pedersen.grouped.v1. Inputs: groups=["PLN","PUSC","PAC","Frente Amplio","PRN","Nueva Republica","PML","PIN","PASE","PRSC","PLP","PPSD","Other"], interval=Previous interval, vectors=[[24.193548387096776,29.704301075268816,2.807646356033453,2.40442054958184,0,2.195340501792115,0,0,0,0.4778972520908005,6.347072879330944,0,31.869772998805256],[23.922558922558924,46.14478114478114,7.609427609427609,0,0.9932659932659933,2.878787878787879,0,0,0,0.40404040404040403,0,0,18.04713804713805],[32.52595155709343,49.02963743041974,10.034602076124568,5.5664209417782455,0,0,1.218594854821724,0,0,1.128328569279374,0,0,0.49646457048292464]]

pedersen volatility

Provisional volatility

22.17percentage points

Grouped Pedersen lower bound (percentage points). Twelve explicitly named standalone national parties; accent variants normalized. Local parties and coalitions remain Other. No alliance votes are attributed to individual member parties. An interval is withheld if either election has no list mapped to an explicit named group. This is aggregate share change, not individual voter switching. Event review: Actual-event and/or comparability review incomplete

Comparison status: Both intervals mean

Method pedersen.grouped.v1. Inputs: groups=["PLN","PUSC","PAC","Frente Amplio","PRN","Nueva Republica","PML","PIN","PASE","PRSC","PLP","PPSD","Other"], interval=Both intervals mean, vectors=[[24.193548387096776,29.704301075268816,2.807646356033453,2.40442054958184,0,2.195340501792115,0,0,0,0.4778972520908005,6.347072879330944,0,31.869772998805256],[23.922558922558924,46.14478114478114,7.609427609427609,0,0.9932659932659933,2.878787878787879,0,0,0,0.40404040404040403,0,0,18.04713804713805],[32.52595155709343,49.02963743041974,10.034602076124568,5.5664209417782455,0,0,1.218594854821724,0,0,1.128328569279374,0,0,0.49646457048292464]]

Source-reported control: Unverified. Current tenure requires separate dated evidence.

5. Officeholder evidence

Dated roster observations are not automatically current tenure. The source current-office flag means this office is tracked now, not that the last winner still holds it.

Officeholder observations
PersonRoleAs ofAffiliationPrincipal?
SERGIO ENRIQUE ORTIZ PEREZREGIDURÍAS PROPIETARIAS2024AVANCE ISIDREÑOprincipal
CHRISTINE MENDOZA MORALESREGIDURÍAS PROPIETARIAS2024AVANCE ISIDREÑOprincipal
FRANCISCO JAVIER MADRIGAL MADRIGALREGIDURÍAS PROPIETARIAS2024UNIDAD SOCIAL CRISTIANAprincipal
LEIDY ARGUEDAS FONSECAREGIDURÍAS PROPIETARIAS2024UNIDAD SOCIAL CRISTIANAprincipal
ANGELICA SALAS MORALESREGIDURÍAS PROPIETARIAS2024LIBERACIÓN NACIONALprincipal
JOSSEPH DANIEL PANIAGUA CAMPOSREGIDURÍAS SUPLENTES2024AVANCE ISIDREÑOsubstitute
YANELA TATIANA ZUÑIGA ARAYAREGIDURÍAS SUPLENTES2024AVANCE ISIDREÑOsubstitute
JOSE DAVID MENA ZUÑIGAREGIDURÍAS SUPLENTES2024UNIDAD SOCIAL CRISTIANAsubstitute
TANNIA CRUZ MASISREGIDURÍAS SUPLENTES2024UNIDAD SOCIAL CRISTIANAsubstitute
ANA MELISSA VINDAS OROZCOREGIDURÍAS SUPLENTES2024LIBERACIÓN NACIONALsubstitute
MINOR JOSE ARCE SOLISREGIDORES(AS) PROPIETARIOS(AS)2020UNIDAD SOCIAL CRISTIANAprincipal
RAQUEL GONZALEZ ARIASREGIDORES(AS) PROPIETARIOS(AS)2020UNIDAD SOCIAL CRISTIANAprincipal
GILBERT ACUÑA CERDASREGIDORES(AS) PROPIETARIOS(AS)2020UNIDAD SOCIAL CRISTIANAprincipal
DENNIS ELADIO AZOFEIFA BOLAÑOSREGIDORES(AS) PROPIETARIOS(AS)2020LIBERACIÓN NACIONALprincipal
ANA MELISSA VINDAS OROZCOREGIDORES(AS) PROPIETARIOS(AS)2020LIBERACIÓN NACIONALprincipal
LEIDY ARGUEDAS FONSECAREGIDORES(AS) SUPLENTES2020UNIDAD SOCIAL CRISTIANAsubstitute
MINOR BOLIVAR OROZCO VALERIOREGIDORES(AS) SUPLENTES2020UNIDAD SOCIAL CRISTIANAsubstitute
MARIA FELICIA VALERIO MADRIGALREGIDORES(AS) SUPLENTES2020UNIDAD SOCIAL CRISTIANAsubstitute
MARCELA CRISTINA GUZMAN CALDERONREGIDORES(AS) SUPLENTES2020LIBERACIÓN NACIONALsubstitute
MARCO VINICIO RAMIREZ VILLALOBOSREGIDORES(AS) SUPLENTES2020LIBERACIÓN NACIONALsubstitute
MANUEL ANTONIO RODRIGUEZ SEGURAREGIDORES(AS) PROPIETARIOS(AS)2016UNIDAD SOCIAL CRISTIANAprincipal
TATIANA MARIA CONTRERAS CASTILLOREGIDORES(AS) PROPIETARIOS(AS)2016UNIDAD SOCIAL CRISTIANAprincipal
LUISA MARIA FONSECA GONZALEZREGIDORES(AS) PROPIETARIOS(AS)2016LIBERACIÓN NACIONALprincipal
FREDDY VARGAS VENEGASREGIDORES(AS) PROPIETARIOS(AS)2016LIBERACIÓN NACIONALprincipal
ELVIRA YGLESIAS MORAREGIDORES(AS) PROPIETARIOS(AS)2016ACCIÓN CIUDADANAprincipal
MARIA FELICIA VALERIO MADRIGALREGIDORES(AS) SUPLENTES2016UNIDAD SOCIAL CRISTIANAsubstitute
KENNER ALBERTO ARRIETA ZAMORAREGIDORES(AS) SUPLENTES2016UNIDAD SOCIAL CRISTIANAsubstitute
JORGE EDUARDO ARAYA RODRIGUEZREGIDORES(AS) SUPLENTES2016LIBERACIÓN NACIONALsubstitute
KATTIA VILLALOBOS ZAMORAREGIDORES(AS) SUPLENTES2016LIBERACIÓN NACIONALsubstitute
ERNIE CHACON CHAVARRIAREGIDORES(AS) SUPLENTES2016ACCIÓN CIUDADANAsubstitute

6. Polling context

No local poll supplied.

7. Unresolved issues and sources

  • other · open

    Published province heading correction: {"issue": "Published province heading correction", "year": 2020, "area": "Heredia", "source_id": "S41377daad8", "resolution": "The amendment corrects CARTAGO to HEREDIA in the second table heading. It changes no votes, winners or seats; the original declaration is joined to Heredia."}

Sources

Cite this record

Center for Digital Democracy. “SAN ISIDRO — Municipal council.” Subnational Election Observatory, releaselatin-america-fe5e91689def, snapshot 2026-09-13. /electiondatabase/offices/CR-C-HEREDIA-SAN-ISIDRO. Sources: costa-rica--url-ae6cfb21525f974d8912a00e, costa-rica--url-9b0bf8940eb485b811da317e, costa-rica--url-f8a1e09c9e89a7e5e9c55114, costa-rica--Sc1df243471, costa-rica--Sdbd8d963ea, costa-rica--Sfa91292290, costa-rica--S2a3f864318, costa-rica--S79669f3e5d, costa-rica--Sf5d1ba0ef9.