ZIP code 78728: Wells Branch, TX
ZIP code 78728 is in Wells Branch (55% of residents), Round Rock (4.2%) and Austin (2.7%), in Travis County (89%) and Williamson County (11%), Texas. 38% of its residents live outside city limits. It is in Texas's 11th congressional district (76%) and Texas's 10th congressional district (24%). Its state senate districts are State Senate District 14 (89%) and State Senate District 5 (11%); its state house districts are State House District 50 (89%), State House District 136 (11%) and State House District 47 (<0.1%).
City and county
| City or town | Share of ZIP residents |
|---|---|
| Wells Branch | 55% |
| Round Rock | 4.2% |
| Austin | 2.7% |
| County | Share of ZIP residents |
|---|---|
| Travis County | 89% |
| Williamson County | 11% |
| Town or county subdivision | Share of ZIP residents |
|---|---|
| Austin CCD | 89% |
| Round Rock-Georgetown CCD | 11% |
Congressional districts
| Congressional district | Share of ZIP residents |
|---|---|
| Texas's 11th congressional district (TX-11) | 76% |
| Texas's 10th congressional district (TX-10) | 24% |
This ZIP is split between districts. A mailing address in it could be in either; the map or locate_point gives the district for an exact address.
Elected officials
| Office | Member | Contact | Share of residents |
|---|---|---|---|
| U.S. Representative (TX-11) | August Pfluger (R) | 202-225-3605 | 76% |
| U.S. Representative (TX-10) | Michael T. McCaul (R) | 202-225-2401 | 24% |
| U.S. Senator | John Cornyn (R) | 202-224-2934 · contact form | statewide |
| U.S. Senator | Ted Cruz (R) | 202-224-5922 · contact form | statewide |
| State Senator (State Senate District 14) | Sarah Eckhardt (Democratic) | 89% | |
| State Senator (State Senate District 5) | Charles Schwertner (R) | 512-863-8456 | 11% |
| State Representative (State House District 50) | James Talarico (Democratic) | 89% | |
| State Representative (State House District 136) | John Bucy (Democratic) | 11% | |
| State Representative (State House District 47) | Vikki Goodwin (Democratic) | <0.1% |
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: State legislators: Open States (public domain); Members of Congress: the @unitedstates project, congress-legislators (CC0).
Local government
- Wells Branch laws: search for the Wells Branch, Texas code of ordinances
- Round Rock website: http://www.roundrocktexas.gov/
- Round Rock laws: search for the Round Rock, Texas code of ordinances
- Austin website: https://austintexas.gov
- Austin laws: search for the Austin, Texas code of ordinances
- Travis County website: https://www.traviscountytx.gov/
- Travis County laws: search for the Travis County, Texas code of ordinances
- Williamson County website: https://www.wilcotx.gov/
- Williamson County laws: search for the Williamson County, Texas code of ordinances
State legislative districts
| State senate district | Share of ZIP residents |
|---|---|
| State Senate District 14 | 89% |
| State Senate District 5 | 11% |
| State house district | Share of ZIP residents |
|---|---|
| State House District 50 | 89% |
| State House District 136 | 11% |
| State House District 47 | <0.1% |
Voting precincts
8 voting precincts overlap ZIP 78728. Map them, with each precinct's share of the ZIP's residents.
Get this in your AI agent
Your agent can get these cities, counties, districts and precincts with their shares, and their GeoJSON boundaries, from Boundary Atlas. Add https://atlas-production-d344.up.railway.app/mcp to Claude, ChatGPT, Cursor or Codex (free, no key; how), then:
related_geographies(id="us:zcta:78728")
ZIP 78728 here is the Census Bureau's ZIP Code Tabulation Area, which approximates the USPS ZIP Code; PO-box-only ZIPs have none. Districts are the maps in force for the November 3, 2026 election.