99chambers

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

Texas's 20th District

A district of about 753,000 people, 69% Hispanic, 22% of adults with a bachelor's degree. It votes D+32.3 relative to the nation for president.

Joaquin Castro (D) · since Jan 3, 2013Next election Nov 7, 2028The 2026 race →
TX-20

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.

D+32.382nd most
Democratic
Most DemocraticMost Republican218th seat · the majority line3718303329TX-207162834352315243295381710213127222531262624143681113119

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. HouseD+55.2

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-20.

Adults with a bachelor's degree22% 6th pct · 34th of 38 in TX

Lower than 94% of seats.

White adults without a degree11% 8th pct · 31st of 38 in TX

Lower than 92% of seats.

Hispanic residents69% 98th pct · 5th of 38 in TX

Higher than 98% of seats.

Black residents9% 57th pct · 22nd of 38 in TX

Higher than 57% of seats.

Asian residents3% 42nd pct · 26th of 38 in TX

Lower than 58% of seats.

People per square mile4,455 91st pct · 2nd of 38 in TX

Denser than 91% 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.

IL-4
66% Hispanic · 25% college gradsD+33.5Held DAZ-3
63% Hispanic · 21% college gradsD+43.1Held DCA-29
63% Hispanic · 26% college gradsD+39.0Held DCA-44
71% HispanicD+40.8Held D

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. Joaquin Castro (D)
    2027– · Won 2026 by 55.2

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