Texas 21st Congressional District
Akashic| Year | Margin (D minus R) |
|---|---|
| 2008 | −26.6% |
| 2012 | −33.9% |
| 2016 | −24.2% |
| 2020 | −16.8% |
| 2024 | −21.9% |
Federal officeholders only. State and local officeholders are planned for the next data pass.
U.S. House
Each result reflects the U.S. House district as it was drawn for that election; redistricting has redrawn these lines over time, so they can differ from the current 120th-Congress district shown on the map above.
| Year | District | Won | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | 21 | R | 36.1%153,765 | 61.9%263,744 | 426,423 |
| 2022 | 21 | R | 37.2%122,655 | 62.8%207,426 | 330,081 |
| 2020 | 21 | R | 45.4%205,780 | 52.0%235,740 | 453,750 |
| 2018 | 21 | R | 47.6%168,421 | 50.2%177,654 | 353,617 |
| 2016 | 21 | R | 36.4%129,765 | 57.0%202,967 | 356,031 |
| 2014 | 21 | R | 0.0%0 | 71.8%135,660 | 188,996 |
| 2012 | 21 | R | 35.4%109,326 | 60.5%187,015 | 308,865 |
| 2010 | 21 | R | 27.9%65,927 | 68.9%162,924 | 236,545 |
| 2008 | 21 | R | 0.0%0 | 80.0%243,471 | 304,350 |
| 2004 | 21 | R | 35.5%121,129 | 61.5%209,774 | 341,119 |
| 2002 | 21 | R | 25.3%56,206 | 72.9%161,836 | 222,093 |
| 2000 | 21 | R | 22.2%73,326 | 75.9%251,049 | 330,878 |
| 1998 | 21 | R | 0.0%0 | 91.4%165,047 | 180,608 |
| 1996 | 21 | R | 22.4%60,338 | 76.4%205,830 | 269,307 |
| 1994 | 21 | R | 0.0%0 | 90.0%165,595 | 184,075 |
| 1992 | 21 | R | 23.7%62,827 | 72.2%190,979 | 264,653 |
| 1990 | 21 | R | 25.2%48,585 | 74.8%144,570 | 193,155 |
| 1988 | 21 | R | 0.0%0 | 93.2%203,989 | 218,790 |
| 1986 | 21 | R | 38.5%63,779 | 60.6%100,346 | 165,567 |
| 1984 | 21 | R | 19.4%48,039 | 80.6%199,909 | 247,980 |
| 1982 | 21 | R | 24.6%35,112 | 74.6%106,515 | 142,872 |
| 1980 | 21 | R | 22.8%58,425 | 76.5%196,424 | 256,744 |
| 1978 | 21 | R | 43.0%63,501 | 57.0%84,336 | 147,837 |
| 1976 | 21 | D | 71.0%149,395 | 26.7%56,211 | 210,300 |
U.S. Senate
| Year | Won | Democratic | Republican | Total |
|---|---|---|---|---|
| 2024 | R | 44.6%5,031,249 | 53.1%5,990,741 | 11,291,854 |
| 2020 | R | 43.9%4,888,764 | 53.5%5,962,983 | 11,144,040 |
| 2018 | R | 48.3%4,045,632 | 50.9%4,260,553 | 8,371,655 |
| 2014 | R | 34.4%1,597,387 | 61.6%2,861,531 | 4,647,370 |
| 2012 | R | 40.6%3,194,927 | 56.5%4,440,137 | 7,864,822 |
| 2008 | R | 42.8%3,389,365 | 54.8%4,337,469 | 7,912,075 |
| 2006 | R | 36.0%1,555,202 | 61.7%2,661,789 | 4,314,663 |
| 2002 | R | 43.3%1,955,758 | 55.3%2,496,243 | 4,512,590 |
| 2000 | R | 32.3%2,025,024 | 65.1%4,078,954 | 6,267,964 |
| 1996 | R | 43.9%2,428,776 | 54.8%3,027,680 | 5,527,441 |
| 1994 | R | 38.3%1,639,615 | 60.8%2,604,218 | 4,279,940 |
| 1990 | R | 37.4%1,429,986 | 60.2%2,302,357 | 3,821,432 |
| 1988 | D | 59.2%3,149,806 | 40.0%2,129,228 | 5,323,023 |
| 1984 | R | 41.4%2,202,557 | 58.5%3,111,348 | 5,314,178 |
| 1982 | D | 58.6%1,818,223 | 40.5%1,256,759 | 3,103,040 |
| 1978 | R | 49.3%1,139,149 | 49.8%1,151,376 | 2,312,540 |
| 1976 | D | 56.8%2,199,956 | 42.2%1,636,370 | 3,874,230 |
Stretching from San Antonio's northern suburbs through the Texas Hill Country to the Permian Basin fringe, TX-21 has trended closer in presidential cycles as Bexar and Travis County spillover precincts add college-educated voters to an otherwise rural base.
Across the recorded series it reached a Republican high of 33.9 points in 2012. Between 2020 and 2024 the district moved 5.1 points toward the Republican candidate; the 2024 margin was 21.9 points.
A population of 766,924, a 65% non-Hispanic-white share, and a median household income of $87,594 describe the district. The district's voting pattern over the last decade is most similar to that of Congressional District 31 and Congressional District 11.
The congressional 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.
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 →
Texas 21st Congressional District. Akashic. https://akashic.app/cd/4821/. Accessed May 20, 2026. License: CC BY 4.0.