Akashic
1892–2024
Akashic
Texas 21st State Senate District
presidential margin
2008D+22.92012D+24.32016D+24.62020D+17.12024D+3.2
full record · 2008 → 2024
D+3.2
2024
median income$69,461U.S. $80,734 · TX $78,476
median age32.7U.S. 39.1 · TX 35.7
poverty rate18.9%U.S. 12.5% · TX 13.8%
bachelor’s+ (25+)31.9%U.S. 35.6% · TX 33.6%
non-english48.6%U.S. 22.3% · TX 35.2%
race · ethnicity · ancestry
Mexican61.1%
Puerto Rican0.9%
Spaniard0.6%
German13.0%
English9.3%
Irish8.0%
African American†3.0%
African0.2%
Asian Indian0.4%
Chinese0.2%
Vietnamese0.2%
religion

Religious adherence is published only at the county level (U.S. Religion Census). See Duval County.

American Community Survey 2024 5-year (income, age, poverty, education, language, race, ancestry) · presidential returns from MIT Election Lab through 2024.

Texas 21st State Senate District

Akashic
Texas 21st State Senate DistrictHarrisD+3.2
2024
2024 presidential margin for Texas 21st State Senate DistrictThe boundary of Texas 21st State Senate District, filled by its 2024 presidential margin (D+3.2), over faint outlines of the counties it is drawn from.Texas 21st State Senate District · D+3.2
How it voted
Share of the 2024 vote
Kamala Harris ✓Democratic50.9%158,206
Donald TrumpRepublican47.8%148,361
Jill SteinGreen1.3%4,063
D+60
R+60
District boundary, filled by its own 2024 D-vs-R margin — precinct detail where available, over the 16 counties it's drawn from (shown faint).
The precinct map shows the 2024 presidential vote; the timeline scrubs the district’s overall result across 1892–2024, on its current boundaries.
County-level results (16 counties) — table
2024 presidential result by county for Texas 21st State Senate District — winner and D-vs-R margin.
CountyWinnerMargin
Bexar County, TXDemocraticD+9.7
Caldwell County, TXRepublicanR+14.4
Dimmit County, TXDemocraticD+3.3
Duval County, TXRepublicanR+9.8
Guadalupe County, TXRepublicanR+29.4
Hays County, TXDemocraticD+5.6
Jim Hogg County, TXDemocraticD+8.3
Karnes County, TXRepublicanR+58.1
La Salle County, TXRepublicanR+20.5
Live Oak County, TXRepublicanR+69.6
McMullen County, TXRepublicanR+84.4
Starr County, TXRepublicanR+16.0
Travis County, TXDemocraticD+39.1
Webb County, TXRepublicanR+2.2
Wilson County, TXRepublicanR+53.6
Zapata County, TXRepublicanR+22.4
5 presidential elections
Third column names the leading third-party or independent finisher. Source · MIT Election Lab · ICPSR · VEST (precinct-level 2024).
YearWonDemocraticRepublicanOtherMarginTotal
D
50.9%Harris158,206
47.8%Trump148,361
1.3%Stein4,063
+3.2%
310,630
D
58.0%Biden174,769
40.9%Trump123,154
1.1%Jorgensen3,272
+17.1%
301,195
D
59.7%Clinton135,754
35.2%Trump79,941
5.1%Johnson11,591
+24.6%
227,286
D
62.1%Obama117,279
37.9%Romney71,475
0.0%
+24.3%
188,754
D
61.0%Obama117,498
38.0%McCain73,283
1.0%Barr1,979
+22.9%
192,760
presidential history
Presidential margin, 2008–2024
Democratic minus Republican, by election
Presidential margin over timeDemocratic-minus-Republican presidential margin from 2008 to 2024. Most recent: +3.2% in 2024.+3.2%DR20082024
Presidential margin over time
YearMargin (D minus R)
2008+22.9%
2012+24.3%
2016+24.6%
2020+17.1%
2024+3.2%
DemocraticRepublican
current representation
Current officeholders
DJudith ZaffiriniState Senate · 21

State legislative officeholder from OpenStates nightly current-legislator data.

Source · OpenStates current legislator CSV.

Its 2024 presidential margin of D+3.2 ranked among Texas's closest, against D+22.9 in 2008. No racial group formed a majority of its residents in the 2024 ACS 5-year, with Hispanic or Latino residents at 61.3%.

Across the recorded series it reached a Democratic high of 24.6 points in 2016. Between 2020 and 2024 the district moved 14.0 points toward the Republican candidate; the 2024 margin was 3.2 points.

A population of 907,942, a 46% non-Hispanic-white share, and a median household income of $69,461 describe the district. The district's voting pattern over the last decade is most similar to that of State Senate District 19 and State Senate District 29.

Political twins — state-senate districts

The state-senate districts whose fingerprint — 2000–2024 trajectory, demographics, ancestry, religion — sits closest to this one, and why.

State Senate District 19
Texas
97.6twin score
% Latinopopulation scale% White
State Senate District 29
Texas
96.0twin score
% Latinopopulation scale12-yr trend≠ % Catholic
State Senate District 27
Texas
95.5twin score
% Latinopopulation scale% White≠ college share

Twin score (0–100) = weighted cosine between tier-standardized fingerprints: presidential margins 2000–2024 with 12-yr trend and elasticity, ACS income, age, education, population and race, top reported ancestries, and religious adherence — chips name the closest-shared dimensions and the widest gap. Re-weight the groups in the twins explorer.

Compare two places, side by side

Twelve curated comparisons line up election history, demographics, and the divergence story for two places at a glance. Browse all comparisons →

Cite this page
All citations released under CC BY 4.0. Attribution: Akashic Intelligence.
Texas 21st State Senate District. Akashic. https://akashic.app/sld-upper/48021/. Accessed May 20, 2026. License: CC BY 4.0.
License: CC BY 4.0
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Places within Texas 21st State Senate District

counties it covers16
Bexar CountyCaldwell CountyDimmit CountyDuval CountyGuadalupe CountyHays CountyJim Hogg CountyKarnes CountyLa Salle CountyLive Oak CountyMcMullen CountyStarr CountyTravis CountyWebb CountyWilson CountyZapata County

Frequently asked questions

How did Texas 21st State Senate District vote in 2024?
In 2024, Texas 21st State Senate District voted Democratic by 3.2 points (D+3.2), carried by the Democratic candidate. Out of 310,630 votes cast, 158,206 went Democratic and 148,361 went Republican.
How many people live in Texas 21st State Senate District?
Texas 21st State Senate District has a population of 907,942 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in Texas 21st State Senate District?
Median household income in Texas 21st State Senate District is $69,461 — below the national median of $80,734. The Texas state median is $78,476.
What is the political history of Texas 21st State Senate District?
Akashic tracks 5 presidential elections in Texas 21st State Senate District from 2008 to 2024. Of those, 5 went Democratic and 0 went Republican.