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

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Office briefing

SAN MARCOS — Municipal government

Tracked current office. Identifiers stay separate from display names.

Mexico · SAN MARCOS / GUERRERO · municipal · Municipal governmentMX-M-12-54

Read the complete original research briefing

INE result distributions kept separate. Certified seats, supplementary elections, coalition and boundary audit remain.

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

Geography
SAN MARCOS / GUERRERO
Next election
2027-06-06
Linked upcoming event
next-1663d76985c8418c18c206e4
Registry qualification
Unknown

2. How certain is that date?

2027-06-06 is expected (not formally called). Day precision. A date without a formal call is not confirmed.

3. Who won earlier selected elections?

2024

Special · Legal certification not established · candidate marks

  • PT_PVEM_MORENA49.1%
  • PRI36.4%
  • PRD4.7%
  • MC2.7%
  • PAC0.6%
  • PSG0.5%
  • PAN0.3%
  • FXMG0.2%
  • REGENERACION0.2%
  • PES0.1%
  • MLGRO0.1%
Results for event-9b363542ee9781cb86ed8db2
Label / candidateParty codeVotesShareSeatsStatus
PT_PVEM_MORENAmexico/S3b4e2832e5/20248,68149.1%UnknownRecorded
PRImexico/S3b4e2832e5/20246,43136.4%UnknownRecorded
PRDmexico/S3b4e2832e5/20248294.7%UnknownRecorded
MCmexico/S3b4e2832e5/20244752.7%UnknownRecorded
PACmexico/S3b4e2832e5/20241130.6%UnknownRecorded
PSGmexico/S3b4e2832e5/2024830.5%UnknownRecorded
PANmexico/S3b4e2832e5/2024520.3%UnknownRecorded
FXMGmexico/S3b4e2832e5/2024420.2%UnknownRecorded
REGENERACIONmexico/S3b4e2832e5/2024290.2%UnknownRecorded
PESmexico/S3b4e2832e5/2024190.1%UnknownRecorded
MLGROmexico/S3b4e2832e5/2024180.1%UnknownRecorded

2021

Special · Legal certification not established · candidate marks

  • PRD26.6%
  • PRI21.2%
  • PVEM16.1%
  • MORENA12.9%
  • PAN7.6%
  • PT4.2%
  • MC3.1%
  • PES2.0%
  • FXP1.6%
Results for event-c4ad535bbc2fef0b4298f75b
Label / candidateParty codeVotesShareSeatsStatus
PRDmexico/S49ce341a94/20216,48526.6%UnknownRecorded
PRImexico/S49ce341a94/20215,16021.2%UnknownRecorded
PVEMmexico/S49ce341a94/20213,92016.1%UnknownRecorded
MORENAmexico/S49ce341a94/20213,14212.9%UnknownRecorded
PANmexico/S49ce341a94/20211,8457.6%UnknownRecorded
PTmexico/S49ce341a94/20211,0294.2%UnknownRecorded
MCmexico/S49ce341a94/20217493.1%UnknownRecorded
PESmexico/S49ce341a94/20214822%UnknownRecorded
FXPmexico/S49ce341a94/20213991.6%UnknownRecorded

2018

Special · Legal certification not established · candidate marks

  • PAN_PRD_MC47.1%
  • PRI_PVEM34.9%
  • MORENA_ES7.2%
  • PPG1.9%
  • PT0.6%
  • PSM0.3%
  • PANAL0.3%
  • PSG0.3%
  • CG0.1%
Results for event-ff8b462e2696c95078b2c236
Label / candidateParty codeVotesShareSeatsStatus
PAN_PRD_MCmexico/S59a3ac29d7/201811,88647.1%UnknownRecorded
PRI_PVEMmexico/S59a3ac29d7/20188,80434.9%UnknownRecorded
MORENA_ESmexico/S59a3ac29d7/20181,8227.2%UnknownRecorded
PPGmexico/S59a3ac29d7/20184691.9%UnknownRecorded
PTmexico/S59a3ac29d7/20181560.6%UnknownRecorded
PSMmexico/S59a3ac29d7/2018810.3%UnknownRecorded
PANALmexico/S59a3ac29d7/2018720.3%UnknownRecorded
PSGmexico/S59a3ac29d7/2018650.3%UnknownRecorded
CGmexico/S59a3ac29d7/2018140.1%UnknownRecorded

4. Competition and volatility

competition index

Provisional imported-series CI

44.60–100 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=13.415215835917003, oldest_gap=13.188411998801833, previous_gap=5.708500280039637

pedersen volatility

Provisional volatility

65.89percentage points

Grouped Pedersen lower bound (percentage points). Seven exact standalone INE party labels. Joint coalition combinations, independents and other parties remain Other, without allocating coalition votes. This coarse grouped comparison can conceal coalition-member shifts and requires the stated geographic/event review. 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=["PAN","PRI","PRD","PT","PVEM","MC","MORENA","Other"], interval=Latest interval, vectors=[[0.3100405437634152,38.34366801812545,4.942761745766754,0,0,2.8321011209158122,0,53.571428571428584],[7.9488173710740595,22.23083882641851,27.939339106458146,4.4332428589892725,16.888544224721038,3.226918271509198,13.536685192365688,3.7956141484640904],[0,0,0,0.6675510291411699,0,0,0,99.33244897085883]]

pedersen volatility

Provisional volatility

95.54percentage points

Grouped Pedersen lower bound (percentage points). Seven exact standalone INE party labels. Joint coalition combinations, independents and other parties remain Other, without allocating coalition votes. This coarse grouped comparison can conceal coalition-member shifts and requires the stated geographic/event review. 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=["PAN","PRI","PRD","PT","PVEM","MC","MORENA","Other"], interval=Previous interval, vectors=[[0.3100405437634152,38.34366801812545,4.942761745766754,0,0,2.8321011209158122,0,53.571428571428584],[7.9488173710740595,22.23083882641851,27.939339106458146,4.4332428589892725,16.888544224721038,3.226918271509198,13.536685192365688,3.7956141484640904],[0,0,0,0.6675510291411699,0,0,0,99.33244897085883]]

pedersen volatility

Provisional volatility

80.71percentage points

Grouped Pedersen lower bound (percentage points). Seven exact standalone INE party labels. Joint coalition combinations, independents and other parties remain Other, without allocating coalition votes. This coarse grouped comparison can conceal coalition-member shifts and requires the stated geographic/event review. 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=["PAN","PRI","PRD","PT","PVEM","MC","MORENA","Other"], interval=Both intervals mean, vectors=[[0.3100405437634152,38.34366801812545,4.942761745766754,0,0,2.8321011209158122,0,53.571428571428584],[7.9488173710740595,22.23083882641851,27.939339106458146,4.4332428589892725,16.888544224721038,3.226918271509198,13.536685192365688,3.7956141484640904],[0,0,0,0.6675510291411699,0,0,0,99.33244897085883]]

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.

No officeholder observation supplied.

6. Polling context

No local poll supplied.

7. Unresolved issues and sources

No open research issues attached to this office.

Sources

Cite this record

Center for Digital Democracy. “SAN MARCOS — Municipal government.” Subnational Election Observatory, releaselatin-america-fe5e91689def, snapshot 2026-09-13. /electiondatabase/offices/MX-M-12-54. Sources: mexico--url-3635e08ffbefd711526cbeea, mexico--S3b4e2832e5, mexico--S49ce341a94, mexico--S59a3ac29d7.