Gerrymander Mapgerrymandermap.us

Texas / TX-21

Texas District 21

40 Middle of the pack

Less compact than 38% of other congressional districts.

268th least compact of 429 nationally, 32nd of 38 in Texas.

A score describes shape, not intent. Coastlines, rivers and the Voting Rights Act can all make a district irregular. How scores work

The three measures

Polsby-Popper
0.31at least as compact as 73% of districts on this measure

Area compared with perimeter. Low for jagged or snaking edges.

Reock
0.45at least as compact as 39% of districts on this measure

Area compared with the smallest circle around the district, counting only land. Low for stretched shapes.

Convex hull
0.83at least as compact as 69% of districts on this measure

Area compared with a rubber band stretched around the district, counting only land. Low for bites and tentacles.

Each measure runs from 0 to 1, where 1 is a perfect circle or a shape with no dents.

New lines for 2026

Texas used a different map in the 2026 election than in 2024: the 2025 enacted plan (HB 4 / PLANC2333). Source: Texas Legislature Online

Cities and towns

The largest places with people in this district, from the 2020 Census. A place split between districts shows how many of its residents live in this one.

And 25 smaller places. 26% of this district's people live outside any city, town or named community. How places are counted

ZIP codes

74 ZIP codes have residents in this district. 46 of them are split with other districts. A percentage is the share of that ZIP code's 2020 residents who live here.

Show all 74 ZIP codes
  • 76849 (1%)
  • 78003 (94%)
  • 78004
  • 78006 (84%)
  • 78010
  • 78013
  • 78015 (27%)
  • 78023 (1%)
  • 78024
  • 78025
  • 78027
  • 78028
  • 78029
  • 78055
  • 78058
  • 78063
  • 78070
  • 78074
  • 78108 (2%)
  • 78130 (66%)
  • 78132 (99%)
  • 78133
  • 78154 (2%)
  • 78163
  • 78208 (1%)
  • 78209 (84%)
  • 78212 (8%)
  • 78213 (40%)
  • 78215 (9%)
  • 78216 (93%)
  • 78217 (19%)
  • 78229 (1%)
  • 78230 (90%)
  • 78231 (14%)
  • 78232 (50%)
  • 78234
  • 78240 (26%)
  • 78247 (2%)
  • 78249 (98%)
  • 78250 (39%)
  • 78254 (26%)
  • 78256 (40%)
  • 78257 (11%)
  • 78258 (2%)
  • 78259
  • 78260 (1%)
  • 78261
  • 78266 (81%)
  • 78606
  • 78618 (83%)
  • 78619 (26%)
  • 78620 (86%)
  • 78623
  • 78624
  • 78631 (86%)
  • 78635
  • 78636
  • 78663 (91%)
  • 78666 (80%)
  • 78669 (2%)
  • 78671
  • 78675
  • 78676 (99%)
  • 78736 (1%)
  • 78737 (25%)
  • 78801 (1%)
  • 78828 (27%)
  • 78833 (93%)
  • 78873
  • 78879 (84%)
  • 78880 (3%)
  • 78883
  • 78884 (44%)
  • 78885

These are the Census Bureau's ZIP code areas, which match residential ZIP codes closely. ZIP codes used only for PO boxes or a single organization aren't included. How ZIP codes are matched

2024 presidential vote

Kamala Harris 39.0%, Donald Trump 61.0%

Shares of the votes for the two of them; other candidates are left out. Texas published 2024 results on its 2026 lines, and these are its figures. Where the votes come from

U.S. House

Mark Teixeira, Republican

Elected November 3, 2026, takes office January 3, 2027.

Unofficial results from the Texas Secretary of State, checked November 6, 2026. A race shows a winner once news decision desks have called it. Results become official when the state certifies them. Where this comes from

Texas's senators

Senators are elected by the whole state, so district lines don't change who they are. Senators serving as of November 6, 2026. Senators elected in November 2026 take office January 3, 2027. Where this comes from

Where it sits in Texas

Spot a problem with this district? Email us about TX-21.