99chambers

U.S. House seat · lines in effect since 2026

Texas's 21st District

A district of about 802,000 people, 36% Hispanic, 44% of adults with a bachelor's degree. It votes R+20.4 relative to the nation for president.

Mark Teixeira (R) · from Jan 3, 2027Next election Nov 7, 2028The 2026 race →
TX-21

Source: 2026 results: Texas Secretary of State; boundaries: Census Bureau TIGER/LineUpdated Nov 7, 2026, 3:01 PM ET

Where it sits among all 435 seats

Every U.S. House seat by partisan lean, from most Democratic to most Republican. Lean is the seat's presidential vote on current lines, relative to the nation.

R+20.4317th most
Democratic
Most DemocraticMost Republican218th seat · the majority line3718303329207162834352315243295381710TX-213127222531262624143681113119

Labels below the bar mark 37 other seats in Texas.

Source: 99chambers: 2024 and 2020 presidential results on current lines, relative to the nation (2024 weighted 3:1)Updated Oct 16, 2026, 5:19 AM ET

Every race on these lines

Results recomputed from precinct returns as if today's boundaries had always existed, so years compare like for like.

2026
U.S. HouseR+9.0

Outlined: the race for this seat itselfBlank: no race that year

Source: 99chambers results archive: precinct results allocated to current lines; 2026: Texas Secretary of StateUpdated Nov 7, 2026, 3:01 PM ET

Who lives here, compared

Grey bars show the spread of all 435 seats. Small marks are other seats in Texas. The black marker is TX-21.

Adults with a bachelor's degree44% 80th pct · 8th of 38 in TX

Higher than 80% of seats.

White adults without a degree29% 35th pct · 18th of 38 in TX

Lower than 65% of seats.

Hispanic residents36% 85th pct · 18th of 38 in TX

Higher than 85% of seats.

Black residents4% 26th pct · 34th of 38 in TX

Lower than 74% of seats.

Asian residents3% 40th pct · 28th of 38 in TX

Lower than 60% of seats.

People per square mile129 30th pct · 26th of 38 in TX

Less dense than 70% of seats.

Source: Census Bureau, American Community Survey 2020–2024 5-year estimates, allocated to current linesUpdated Oct 13, 2026, 5:06 AM ET

Seats most like this one

Nearest seats on demographics, density and lean.

TX-10
22% Hispanic · 43% college gradsR+20.4Held RFL-22
33% Hispanic · 42% college gradsR+7.3Held DTX-17
25% Hispanic · 35% college gradsR+20.3Held RTX-31
24% Hispanic · 35% college gradsR+20.4Held R

Source: Census Bureau, American Community Survey 2020–2024 5-year estimates, allocated to current lines; 99chambers: 2024 and 2020 presidential results on current lines, relative to the nation (2024 weighted 3:1)Updated Oct 16, 2026, 5:19 AM ET

Who has held it

These lines took effect in 2026.

  1. Mark Teixeira (R)
    2027– · Won 2026 by 9.0

Source: Past results: 99chambers results archive (MEDSL, Klarner, state election offices)