Texas Congressional District 21

Voters

Registered Voters: 590,228
Active Voters: 557,540 (94.5%)

Party Registration

This state's voter file does not record party registration.

Turnout by Cycle

Cycle	General	Democratic Primary	Republican Primary
2023–2024	416,030 (70.5%)	33,515 (5.7%)	106,378 (18.0%)
2021–2022	312,453 (52.9%)	36,410 (6.2%)	90,011 (15.3%)
2019–2020	374,393 (63.4%)	66,239 (11.2%)	79,056 (13.4%)
2017–2018	276,998 (46.9%)	31,880 (5.4%)	66,868 (11.3%)
2015–2016	276,675 (46.9%)	36,119 (6.1%)	107,171 (18.2%)
2013–2014	155,928 (26.4%)	12,113 (2.1%)	53,717 (9.1%)
2011–2012	227,508 (38.5%)	10,103 (1.7%)	54,398 (9.2%)

Turnout counts today's registered voters with a counted ballot in the cycle's elections (the odd and even year), as a share of today's registered voters. Voters who have since left the rolls are not counted.

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Source: Civitech voter file snapshot as of 08/14/2025. These are registered voters, separate from the Census population figures. Counts under 10 are suppressed and shown as "<10".

Demographics

Total Citizen Population: 774,771
Citizen Voting Age Population (CVAP): 602,684

Citizen Population by Race/Ethnicity

Group	Citizens	Share
Non-Hispanic	542,450	70.0%
Hispanic	232,315	30.0%
White	478,650	61.8%
Black	26,069	3.4%
Asian	14,404	1.9%
American Indian / Alaska Native	940	0.1%
Native Hawaiian / Pacific Islander	647	0.1%
Two or More Races	3,075	0.4%

Citizen Voting Age Population by Race/Ethnicity

Group	CVAP	Share
Non-Hispanic	439,765	73.0%
Hispanic	162,925	27.0%
White	392,726	65.2%
Black	25,058	4.2%
Asian	14,233	2.4%
American Indian / Alaska Native	5,308	0.9%
Native Hawaiian / Pacific Islander	557	0.1%
Two or More Races	2,083	0.3%

Source: Redistricting Data Hub / U.S. Census Bureau CVAP Special Tabulation.