Office briefing

SANTA MARIA DEL RIO — Municipal government

Tracked current office. Identifiers stay separate from display names.

Mexico · SANTA MARIA DEL RIO / SAN LUIS POTOSI · municipal · Municipal governmentMX-M-24-33

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: SANTA MARIA DEL RIO / SAN LUIS POTOSI
Next election: 2027-06-06
Linked upcoming event: next-d2c63bef2be6d6711a6edecc
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

MORENA30.8%
PVEM28.9%
PRI18.0%
PAN10.8%
MC6.7%
PRD1.0%
ML0.1%

Results for event-2c5b98400704761572e58ef6
Label / candidate	Party code	Votes	Share	Seats	Status
MORENA	mexico/Sde57bfccca/2024	6,217	30.8%	Unknown	Recorded
PVEM	mexico/Sde57bfccca/2024	5,833	28.9%	Unknown	Recorded
PRI	mexico/Sde57bfccca/2024	3,643	18%	Unknown	Recorded
PAN	mexico/Sde57bfccca/2024	2,182	10.8%	Unknown	Recorded
MC	mexico/Sde57bfccca/2024	1,346	6.7%	Unknown	Recorded
PRD	mexico/Sde57bfccca/2024	199	1%	Unknown	Recorded
ML	mexico/Sde57bfccca/2024	20	0.1%	Unknown	Recorded

2021

Special · Legal certification not established · candidate marks

PAN_PRD56.4%
PRI_PCP27.3%
PT_PVEM7.9%
NASLP2.2%
MORENA1.9%
PES0.6%

Results for event-e73ed8fcc5a9385b7ff1d01c
Label / candidate	Party code	Votes	Share	Seats	Status
PAN_PRD	mexico/S4bf4efa7db/2021	12,501	56.4%	Unknown	Recorded
PRI_PCP	mexico/S4bf4efa7db/2021	6,046	27.3%	Unknown	Recorded
PT_PVEM	mexico/S4bf4efa7db/2021	1,743	7.9%	Unknown	Recorded
NASLP	mexico/S4bf4efa7db/2021	493	2.2%	Unknown	Recorded
MORENA	mexico/S4bf4efa7db/2021	430	1.9%	Unknown	Recorded
PES	mexico/S4bf4efa7db/2021	130	0.6%	Unknown	Recorded

2018

Special · Legal certification not established · candidate marks

PRI_PANAL36.3%
PVEM24.0%
PAN_MC21.9%
PRD10.3%
PT_MORENA_ES3.5%

Results for event-a6a321a5baba674eb43a3223
Label / candidate	Party code	Votes	Share	Seats	Status
PRI_PANAL	mexico/S6ca0225f1e/2018	7,608	36.3%	Unknown	Recorded
PVEM	mexico/S6ca0225f1e/2018	5,020	24%	Unknown	Recorded
PAN_MC	mexico/S6ca0225f1e/2018	4,587	21.9%	Unknown	Recorded
PRD	mexico/S6ca0225f1e/2018	2,167	10.3%	Unknown	Recorded
PT_MORENA_ES	mexico/S6ca0225f1e/2018	727	3.5%	Unknown	Recorded

4. Competition and volatility

competition index

Provisional imported-series CI

42.270–100 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=1.9753086419753068, oldest_gap=12.86985926699488, previous_gap=30.244108138499744

pedersen volatility

Provisional volatility

97.88percentage 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=[[11.224279835390947,18.73971193415638,1.0236625514403292,0,30.005144032921812,6.923868312757202,31.98045267489712,0.102880658436214],[0,0,0,0,0,0,2.0147120835871246,97.98528791641289],[0,0,10.776269332139838,0,24.963946491620668,0,0,64.25978417623949]]

pedersen volatility

Provisional volatility

35.74percentage points

Comparison status: Previous interval

Method pedersen.grouped.v1. Inputs: groups=["PAN","PRI","PRD","PT","PVEM","MC","MORENA","Other"], interval=Previous interval, vectors=[[11.224279835390947,18.73971193415638,1.0236625514403292,0,30.005144032921812,6.923868312757202,31.98045267489712,0.102880658436214],[0,0,0,0,0,0,2.0147120835871246,97.98528791641289],[0,0,10.776269332139838,0,24.963946491620668,0,0,64.25978417623949]]

pedersen volatility

Provisional volatility

66.81percentage 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=[[11.224279835390947,18.73971193415638,1.0236625514403292,0,30.005144032921812,6.923868312757202,31.98045267489712,0.102880658436214],[0,0,0,0,0,0,2.0147120835871246,97.98528791641289],[0,0,10.776269332139838,0,24.963946491620668,0,0,64.25978417623949]]

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_24_33_2024.json · rights unknown
Mexico: mx_returns_AYUN_24_33_2021.json · rights unknown
Mexico: mx_returns_AYUN_24_33_2018.json · rights unknown

Cite this record

Center for Digital Democracy. “SANTA MARIA DEL RIO — Municipal government.” Subnational Election Observatory, releaselatin-america-fe5e91689def, snapshot 2026-09-13. /electiondatabase/offices/MX-M-24-33. Sources: mexico--url-3635e08ffbefd711526cbeea, mexico--Sde57bfccca, mexico--S4bf4efa7db, mexico--S6ca0225f1e.