Office briefing

SANTIAGO TAPEXTLA — Municipal government

Tracked current office. Identifiers stay separate from display names.

Mexico · SANTIAGO TAPEXTLA / OAXACA · municipal · Municipal governmentMX-M-20-487

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: SANTIAGO TAPEXTLA / OAXACA
Next election: 2027-06-06
Linked upcoming event: next-6f3329ba20ae063269ad2523
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

PT38.6%
MORENA22.7%
FXMO20.4%
PVEM12.6%
MC0.7%
NAO0.3%
PRD0.2%

Results for event-8ad016ec254483ea374f7a4b
Label / candidate	Party code	Votes	Share	Seats	Status
PT	mexico/Se7fdd29765/2024	556	38.6%	Unknown	Recorded
MORENA	mexico/Se7fdd29765/2024	327	22.7%	Unknown	Recorded
FXMO	mexico/Se7fdd29765/2024	294	20.4%	Unknown	Recorded
PVEM	mexico/Se7fdd29765/2024	182	12.6%	Unknown	Recorded
MC	mexico/Se7fdd29765/2024	10	0.7%	Unknown	Recorded
NAO	mexico/Se7fdd29765/2024	5	0.3%	Unknown	Recorded
PRD	mexico/Se7fdd29765/2024	3	0.2%	Unknown	Recorded

2021

Special · Legal certification not established · candidate marks

FXM34.5%
PES32.4%
PAN_PRI_PRD11.6%
MORENA8.9%
NAO8.2%
PT0.8%

Results for event-4cc653c466ef2b6597712f5a
Label / candidate	Party code	Votes	Share	Seats	Status
FXM	mexico/S3bb1d10c9d/2021	543	34.5%	Unknown	Recorded
PES	mexico/S3bb1d10c9d/2021	509	32.4%	Unknown	Recorded
PAN_PRI_PRD	mexico/S3bb1d10c9d/2021	183	11.6%	Unknown	Recorded
MORENA	mexico/S3bb1d10c9d/2021	140	8.9%	Unknown	Recorded
NAO	mexico/S3bb1d10c9d/2021	129	8.2%	Unknown	Recorded
PT	mexico/S3bb1d10c9d/2021	13	0.8%	Unknown	Recorded

2018

Special · Legal certification not established · candidate marks

PANAL38.6%
PRI31.5%
PT_MORENA_ES19.3%
PAN_PRD_MC6.4%
PVEM0.5%
PUP0.1%

Results for event-2fac5c286c6665c5dd78f132
Label / candidate	Party code	Votes	Share	Seats	Status
PANAL	mexico/S292ead585d/2018	628	38.6%	Unknown	Recorded
PRI	mexico/S292ead585d/2018	513	31.5%	Unknown	Recorded
PT_MORENA_ES	mexico/S292ead585d/2018	315	19.3%	Unknown	Recorded
PAN_PRD_MC	mexico/S292ead585d/2018	105	6.4%	Unknown	Recorded
PVEM	mexico/S292ead585d/2018	8	0.5%	Unknown	Recorded
PUP	mexico/S292ead585d/2018	2	0.1%	Unknown	Recorded

4. Competition and volatility

competition index

Provisional imported-series CI

43.090–100 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=16.630355846042118, oldest_gap=7.320178230426485, previous_gap=2.2412656558998023

pedersen volatility

Provisional volatility

68.2percentage 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=[[0,0,0.2178649237472767,40.37763253449528,13.217138707334787,0.7262164124909223,23.74727668845316,21.713870733478576],[0,0,0,0.8569545154911009,0,0,9.22874093605801,89.91430454845089],[0,32.65436028007638,0,0,0.5092297899427116,0,0,66.8364099299809]]

pedersen volatility

Provisional volatility

33.16percentage points

Comparison status: Previous interval

Method pedersen.grouped.v1. Inputs: groups=["PAN","PRI","PRD","PT","PVEM","MC","MORENA","Other"], interval=Previous interval, vectors=[[0,0,0.2178649237472767,40.37763253449528,13.217138707334787,0.7262164124909223,23.74727668845316,21.713870733478576],[0,0,0,0.8569545154911009,0,0,9.22874093605801,89.91430454845089],[0,32.65436028007638,0,0,0.5092297899427116,0,0,66.8364099299809]]

pedersen volatility

Provisional volatility

50.68percentage points

Comparison status: Both intervals mean

Method pedersen.grouped.v1. Inputs: groups=["PAN","PRI","PRD","PT","PVEM","MC","MORENA","Other"], interval=Both intervals mean, vectors=[[0,0,0.2178649237472767,40.37763253449528,13.217138707334787,0.7262164124909223,23.74727668845316,21.713870733478576],[0,0,0,0.8569545154911009,0,0,9.22874093605801,89.91430454845089],[0,32.65436028007638,0,0,0.5092297899427116,0,0,66.8364099299809]]

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

Mexico: https://sicee-api.ine.mx/api/v1/local/cards/getTarjOnceTablasamunicipiosLoc · rights unknown
Mexico: mx_returns_AYUN_20_487_2024.json · rights unknown
Mexico: mx_returns_AYUN_20_487_2021.json · rights unknown
Mexico: mx_returns_AYUN_20_487_2018.json · rights unknown

Cite this record

Center for Digital Democracy. “SANTIAGO TAPEXTLA — Municipal government.” Subnational Election Observatory, releaselatin-america-fe5e91689def, snapshot 2026-09-13. /electiondatabase/offices/MX-M-20-487. Sources: mexico--url-3635e08ffbefd711526cbeea, mexico--Se7fdd29765, mexico--S3bb1d10c9d, mexico--S292ead585d.