- Lead
- 4,941
- Total
- 101,266
- vs nation
- R+3.4
Texas 121st State House District
President margin by year
Place winner margin
President results by year
Modeled candidate-vote estimate on current district boundaries
- Lead
- 2,419
- Total
- 104,721
- vs nation
- R+6.8
- Lead
- 11,120
- Total
- 83,853
- vs nation
- R+15.4
- Lead
- 16,511
- Total
- 71,598
- vs nation
- R+26.9
- Lead
- 16,178
- Total
- 73,148
- vs nation
- R+29.4
- Lead
- 24,792
- Total
- 65,287
- vs nation
- R+35.5
- Lead
- 19,471
- Total
- 56,146
- vs nation
- R+35.2
- Lead
- 10,620
- Total
- 47,083
- vs nation
- R+31.1
Key facts
- 2024 presidential margin
- R+4.9MIT Election Lab
- Population
- 203,2092024 5-year
- Population density
- 1,981 / sq mi2024 5-year · TIGER/Line
- Land area
- 103 sq miTIGER/Line
- Median household income
- $98,0472024 5-year
- White (non-Hispanic)
- 48.3%2024 5-year
- Black
- 5.8%2024 5-year
- Hispanic / Latino
- 36.4%2024 5-year
- Peak Democratic margin
- D+40.7 in 1932MIT Election Lab
- Peak Republican margin
- R+45.5 in 1972MIT Election Lab
- Most similar
- State House District 122, TX · twin score 96.4
presidential history
Party record book
Texas 121st State House District · the strongest Democratic and Republican presidential performances recorded here, measured three ways.
1892–2024 (partial returns from 1876) · 38 presidential cycles · 38 with a vote-share denominator · 34 with a national benchmark
Highest vote share
Largest share of the presidential candidate vote cast here.
Democratic
Franklin D. Roosevelt1932
68.3%
3,597 votes · D+40.7 · modeled estimate
Runner-up · Franklin D. Roosevelt, 1936 · 57.6%
Republican
Ronald Reagan1984
72.4%
34,926 votes · R+45.4 · modeled estimate
Runner-up · Richard Nixon, 1972 · 72.3%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Joe Biden2020
50,140votes
47.9% of the vote · R+2.3 · modeled estimate
Runner-up · Kamala Harris, 2024 · 47,514 votes
Republican
Donald Trump2020
52,559votes
50.2% of the vote · R+2.3 · modeled estimate
Runner-up · Donald Trump, 2024 · 52,455 votes
Best relative to the U.S.
This Place’s margin against the national margin in the same election — positive when it leaned toward the party more than the country did.
Democratic
Franklin D. Roosevelt1932
+22.9pts D vs U.S.
Place D+40.7 · U.S. D+17.8 · modeled estimate
Runner-up · Alton B. Parker, 1904 · +21.0 pts
Republican
George W. Bush2004
+35.5pts R vs U.S.
Place R+38.0 · U.S. R+2.5 · modeled estimate
Runner-up · George W. Bush, 2000 · +35.2 pts
Current officeholders
State legislative officeholder from OpenStates nightly current-legislator data.
Senate and governor results are in the Office selector at the top of this page.
U.S. House
Each row is a county-allocated estimate of U.S. House votes for this district — county returns apportioned onto its boundary, not precinct-counted. “Vote lead” is the estimated local lead here, not necessarily the winner of the full contest.
Texas House District 121, anchored in northern Bexar County, recorded an R+4.9 presidential margin in 2024 — a tighter spread than many neighboring districts, reflecting the demographic churn reshaping San Antonio's outer suburbs.
Across the recorded series it reached a Democratic high of 40.7 points in 1932 and a Republican high of 45.5 points in 1972. Between 2020 and 2024 the district moved 2.6 points toward the Republican candidate; the 2024 margin was 4.9 points.
A population of 203,209, a 48% non-Hispanic-white share, and a median household income of $98,047 describe the district. The district's voting pattern over the last decade is most similar to that of State House District 122 and State House District 129.
The state-house districts whose fingerprint — 2000–2024 trajectory, demographics, ancestry, religion — sits closest to this one, and why.
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.
District research tools
Open the source-auditable district brief for electoral baseline, electorate, current-cycle coverage, geography, official dates, and methodology. Open campaign intelligence report → · Browse all comparisons →
Texas 121st State House District. Akashic. https://akashic.app/sld-lower/48121/. Accessed May 20, 2026. License: CC BY 4.0.