Texas's 21st congressional district (TX-21)
Texas's 21st congressional district (TX-21) covers parts or all of 9 counties, including Bandera County, Blanco County, Comal County, Gillespie County, Kendall County and Kerr County, and 74 ZIP codes (28 wholly inside it). Its 2020 population was 766,987. This is the map in force for the November 3, 2026 election.
Who represents TX-21
| Office | Member | Contact |
|---|---|---|
| U.S. Representative (TX-21) | Chip Roy (R) | 202-225-4236 |
| U.S. Senator | John Cornyn (R) | 202-224-2934 · contact form |
| U.S. Senator | Ted Cruz (R) | 202-224-5922 · contact form |
Elected in 2024 under TX's previous congressional map; this district's lines changed for the 120th Congress (seated January 3, 2027).
Officials serving now (members of Congress until January 3, 2027). Sources: Members of Congress: the @unitedstates project, congress-legislators (CC0).
Counties
| County | Share of the county's residents in TX-21 |
|---|---|
| Bandera County | 100% |
| Blanco County | 100% |
| Comal County | 100% |
| Gillespie County | 100% |
| Kendall County | 100% |
| Kerr County | 100% |
| Real County | 100% |
| Hays County | 45% |
| Bexar County | 17% |
ZIP codes
Percentages mark ZIPs only partly in TX-21: the share of that ZIP's residents inside it.
- 76849 (1.1%)
- 78003 (94%)
- 78004
- 78006 (84%)
- 78010
- 78013
- 78015 (28%)
- 78023 (0.7%)
- 78024
- 78025
- 78027
- 78028
- 78029
- 78055
- 78058
- 78063
- 78070
- 78074
- 78108 (2.5%)
- 78130 (66%)
- 78132 (99%)
- 78133
- 78154 (1.5%)
- 78163
- 78208 (1.5%)
- 78209 (84%)
- 78212 (8.2%)
- 78213 (40%)
- 78215 (8.9%)
- 78216 (93%)
- 78217 (19%)
- 78229 (0.8%)
- 78230 (90%)
- 78231 (14%)
- 78232 (50%)
- 78234
- 78240 (26%)
- 78247 (1.9%)
- 78249 (98%)
- 78250 (39%)
- 78254 (26%)
- 78256 (40%)
- 78257 (11%)
- 78258 (1.8%)
- 78259
- 78260 (<0.1%)
- 78261
- 78266 (81%)
- 78606
- 78618 (83%)
- 78619 (26%)
- 78620 (86%)
- 78623
- 78624
- 78631 (86%)
- 78635
- 78636
- 78663 (91%)
- 78666 (80%)
- 78669 (1.7%)
- 78671
- 78675
- 78676 (100%)
- 78736 (0.4%)
- 78737 (25%)
- 78801 (0.3%)
- 78828 (27%)
- 78833 (93%)
- 78873
- 78879 (84%)
- 78880 (2.8%)
- 78883
- 78884 (44%)
- 78885
Towns
Bandera CCD, Blanco CCD, Boerne CCD, Camp Wood-Leakey CCD, Canyon Lake CCD, Center Point CCD, Comfort CCD, Fredericksburg CCD, Harper CCD, Ingram CCD, Johnson City CCD, Kerrville CCD, Medina CCD, New Braunfels CCD, Stonewall CCD, San Marcos CCD, Dripping Springs-Wimberley CCD, San Antonio North CCD, San Antonio Northwest CCD, San Antonio Central CCD, San Antonio Northeast CCD and Kyle-Buda CCD.
Get this in your AI agent
Your agent can draw every precinct in TX-21, or list them with population shares (related_geographies). Add https://boundarymcp.com/mcp to Claude, ChatGPT, Cursor or Codex (free, no key; how), then:
get_boundaries(id="us:congressional_district:4821", children_level="precinct", include_districts=True)