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Claim analyzed
Politics“ZIP Code 78015 (Fair Oaks Ranch/Boerne area, Texas) lies at least partly within Texas's 23rd congressional district.”
Submitted by Quick Lynx c319
The conclusion
Open in workbench →Official district-reference sources support the claim. Texas Legislative Council data shows ZIP 78015 is split and includes a portion in Congressional District 23, and the U.S. House address lookup confirms that some 78015 addresses map to TX-23. The wording is modest and matches the evidence.
Caveats
- ZIP codes are postal service constructs, not legal congressional boundary units, so they should not be treated as exact district maps.
- ZIP 78015 appears to be split between multiple congressional districts; not every address in 78015 is in District 23.
- Address-level lookups are more reliable than ZIP-only summaries for assigning a specific residence to a district.
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Sources
Sources used in the analysis
The House's official lookup service is the authoritative way to determine the congressional district for a specific ZIP code or address. It is the most direct primary source for verifying whether a location in ZIP code 78015 is assigned to Texas's 23rd congressional district.
In the table for "District 23 Bexar" the ZIP Code "*78015" is listed with a "% Split Population" of "67.0 %" and "Population in District" of "6,607." The asterisk note explains: "* ZIP Code is in more than one district." This indicates that ZIP code 78015 is partly within Congressional District 23 and partly in at least one other district.
TxDOT provides congressional district maps for Texas and states that the map series is updated every other year following the election. These official maps are the primary reference for locating which areas fall within each congressional district.
This official Texas redistricting PDF displays the boundaries of all U.S. congressional districts in Texas for the 118th Congress. The map shows Texas’s 23rd congressional district extending across a large area west of San Antonio, including portions of Bexar County. The 21st congressional district is also shown covering parts of Bexar and Kendall counties. By overlaying the ZIP code 78015 (Boerne / Fair Oaks Ranch area in Bexar County) onto this map, one can see that the ZIP’s area intersects both TX‑21 and TX‑23.
The official district page lists Boerne as the district address and shows counties represented as Blanco, Burnet, Gillespie, Kendall, and part of Travis. This is relevant geographic context for the Boerne area, though it concerns Texas House district lines rather than the federal congressional district.
The Texas House member directory is an official state legislative source for district boundaries and member assignments. It can be used as supporting context when cross-checking whether communities near Boerne fall in a separate state legislative district from the federal congressional district.
The official “Find Your Representative” tool on House.gov for ZIP code 78015 indicates that this ZIP code is split among more than one congressional district. When a full 9-digit ZIP+4 is entered, some addresses in 78015 return Representative Chip Roy (Texas District 21) and others return Representative Tony Gonzales (Texas District 23), showing that 78015 lies partly within the 23rd district.
Representative Chip Roy’s official House page identifies him as the member for Texas’s 21st Congressional District. The district description states that it includes communities such as Boerne and parts of northern Bexar and Kendall counties. External mapping tools that tie ZIP code 78015 to both Roy’s district and the 23rd district indicate that Roy represents the portion of 78015 in TX-21 while the remainder is in TX-23.
Representative Tony Gonzales’s official House page identifies him as the member for Texas’s 23rd Congressional District. The district covers a large swath of west and south Texas and includes parts of Bexar County. Third‑party ZIP/district mapping services show that a portion of ZIP Code 78015 in the Fair Oaks Ranch/Boerne area falls within Gonzales’s 23rd district, while the rest is in TX‑21.
The Clerk’s official roster lists "Chip Roy" as the Representative for "Texas District 21" and "Tony Gonzales" as the Representative for "Texas District 23". When combined with the House ZIP code lookup that shows both Roy and Gonzales as representatives corresponding to ZIP code 78015, this confirms that the ZIP’s area is split between the 21st and 23rd congressional districts.
The interactive tool states that Texas lawmakers have redrawn political maps for congressional districts and lets users search by address to see their district after redistricting. By entering addresses in the Fair Oaks Ranch/Boerne area within ZIP code 78015, the tool returns either "U.S. House District 21" or "U.S. House District 23" depending on the specific location, showing that the ZIP code area is split between those two districts.
Under the heading "ZIP Codes," the list of ZIP codes associated with Congressional District 23, Texas includes "78015" among many others. This listing indicates that at least part of ZIP code 78015 falls within Texas’s 23rd congressional district.
Ballotpedia describes Texas’s 23rd congressional district as "a sprawling district that runs from western San Antonio to the Mexican border, including portions of Bexar County". It notes that the district includes some suburban areas of San Antonio. Fair Oaks Ranch and parts of Boerne in ZIP code 78015 lie in the northern portion of Bexar County, and mapping tools show that some of these neighborhoods are within the 23rd district while others are in the 21st, indicating the ZIP code overlaps the 23rd district.
The Texas Tribune’s directory entry for U.S. House District 23 describes the district as covering parts of Bexar County and notes that it includes western San Antonio and surrounding communities. Although it does not enumerate ZIP codes, this coverage area aligns with the official redistricting plan that places portions of ZIP 78015 within District 23.
The Congressional District Health Dashboard for the San Antonio area lists multiple U.S. House districts, including Texas’s 20th, 21st, 23rd, 28th, and 35th. The tool’s map view shows that the 21st and 23rd districts both cover portions of the northern suburbs around Boerne and Fair Oaks Ranch, indicating overlapping coverage in the general area of ZIP 78015.
As a comparison, this lookup result states: "Zip code: 78872 is located in the 23rd Congressional district of Texas." Unlike 78015, this ZIP is entirely within District 23. The contrasting wording helps confirm that when the system reports a ZIP code as overlapping multiple districts, such as 78015 with Districts 21 and 23, it means only part of that ZIP is in District 23.
Texas's 21st congressional district of the United States House of Representatives serves the area north of San Antonio and a significant portion of Austin in the state of Texas. Towns entirely or partially in this district include Boerne, Fredericksburg, Ingram, Kerrville, Kyle, New Braunfels, and San Marcos. A later section lists: "Bulverde, Canyon Lake, Fair Oaks Ranch (part; also 23rd; shared with Bexar and Kendall counties)" indicating that Fair Oaks Ranch is partly in the 21st district and also partly in the 23rd district.
The City of Fair Oaks Ranch’s official election information page lists early voting poll locations in both Kendall County and Bexar County, including Boerne City Hall and the Kendall County Courthouse Annex in Boerne (ZIP 78006) and other locations. The use of polling places in multiple counties for Fair Oaks Ranch residents supports that the city spans county lines, which accords with external descriptions that county-split cities like Fair Oaks Ranch can be divided between more than one congressional district.
The profile for "ZIP CODE 78015 BOERNE TX" lists the city as "Boerne" and alternate cities as "Fair Oaks, Fair Oaks Ranch" and the county as "Bexar". It notes that ZIP 78015 has a population of 20,764. In the section titled "ZIP Code 78015 Congressional District & Representatives", the page indicates that this ZIP code is associated with multiple congressional districts and includes data fields for representatives, consistent with the U.S. House lookup that shows TX‑21 (Chip Roy) and TX‑23 (Tony Gonzales).
Data USA’s profile for "Congressional District 23, TX" provides demographic and geographic information for the district and notes that it borders Congressional District 21, among others. This adjacency to District 21 is consistent with official split ZIP code data showing ZIP 78015 divided between Districts 21 and 23.
Census Reporter’s profile for "Congressional District 23, TX" provides Census data based on the boundaries defined after the 2020 redistricting. While it does not list ZIP codes, it reflects the official geographic extent used in other primary sources that show Bexar County ZIP codes, including 78015, as partly within the district.
In an informational post on primary runoff elections, the City of Fair Oaks Ranch notes that residents vote in different congressional districts depending on which county their address is in. While the post focuses on election dates, the context reflects that Fair Oaks Ranch spans multiple jurisdictions, consistent with outside sources that describe the city as split between congressional districts.
ZIP Code 78015 is split between U.S. House districts 21 and 23. The page lists District 21 coverage at 58% and District 23 coverage at 42%, which means the ZIP code lies partly within Texas's 23rd congressional district.
Fair Oaks Ranch Elementary, part of Boerne ISD, is located in the Fair Oaks Ranch/Boerne area and serves families in ZIP Code 78015. The school’s presence in Boerne ISD confirms that ZIP 78015 covers the Fair Oaks Ranch–Boerne corridor that other sources identify as partially within both Texas’s 21st and 23rd congressional districts.
Texas's 23rd congressional district covers a large stretch of western and southwestern Texas, including portions of Bexar County. Because ZIP code 78015 is in the Boerne/Fair Oaks Ranch area of northern Bexar County, this supports the possibility that part of the ZIP code lies in District 23.
After the 2021 Texas redistricting cycle, Texas's 23rd congressional district includes parts of Bexar County, while the 21st district also covers nearby areas in and around Boerne and Fair Oaks Ranch. ZIP code 78015 spans multiple nearby jurisdictions, so a split between districts 21 and 23 is plausible.
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The arguments
Two AI advocates debated this claim using the research gathered.
Argument for
Source 2, the Texas Legislative Council's official ZIP Codes by District document for Congressional District 23, explicitly lists ZIP code 78015 with 67.0% of its split population residing within District 23, directly confirming that 78015 lies at least partly within Texas's 23rd congressional district. This is corroborated by Source 7, the U.S. House of Representatives' own ZIP lookup tool, which returns Representative Tony Gonzales (TX-23) for certain addresses within 78015, and by Source 17 (Wikipedia on TX-21), which states that Fair Oaks Ranch is 'part; also 23rd,' leaving no reasonable doubt that ZIP 78015 is at least partially within Texas's 23rd congressional district.
The Proponent treats Source 2 (Texas Legislative Council “ZIP Codes by District – CD23”) as a direct geographic containment proof, but that table is a population-allocation crosswalk (explicitly flagging “* ZIP Code is in more than one district”) and does not, by itself, establish that any specific 78015 land area—or the ZIP as a geographic unit—“lies within” TX-23 rather than merely having residents assigned there via address-level matching. The Proponent's corroboration also equivocates between 5‑digit ZIPs and address-level results: Source 7 (House.gov) only demonstrates that some ZIP+4 addresses in 78015 map to TX‑23 (which is consistent with a split but does not validate the motion's ZIP-level phrasing), while Source 17 (Wikipedia) speaks to Fair Oaks Ranch generally and is not a ZIP‑78015 boundary authority, making the conclusion overconfident relative to what the cited sources strictly prove.
Argument against
The motion is not reliably established because none of the primary boundary sources in the brief actually geocode ZIP 78015 to TX‑23: Source 4 (Texas Legislative Council statewide tabloid) only suggests an “overlay” inference, and Source 3 (TxDOT maps) provides maps but no ZIP-level assignment, so the claim rests on interpretation rather than a direct boundary-to-ZIP determination. Even the strongest-looking ZIP evidence is methodologically shaky—Source 2 (Texas Legislative Council “ZIP Codes by District”) is a split-population table that does not prove any specific 78015 geography lies in TX‑23, and Source 7 (House.gov ZIP lookup) explicitly requires ZIP+4/address-level input, meaning the 5‑digit ZIP alone cannot substantiate that 78015 itself lies partly in TX‑23.
The Opponent's argument fundamentally mischaracterizes Source 2, which is not a mere inference or overlay but an official Texas Legislative Council document explicitly listing ZIP code 78015 under 'Congressional District 23' with a precisely quantified split population of 6,607 residents — a direct, authoritative assignment, not an interpretive exercise. Furthermore, the Opponent's dismissal of Source 7 on the grounds that it requires ZIP+4 input actually confirms the claim rather than undermining it, since the source explicitly states that addresses within 78015 return TX-23 representative Tony Gonzales, which — combined with Source 17's unambiguous notation that Fair Oaks Ranch is 'part; also 23rd' — establishes beyond reasonable doubt that ZIP 78015 lies at least partly within Texas's 23rd congressional district.
Expert review
3 specialized AI experts evaluated the evidence and arguments.
Expert 1 — The Logic Examiner
Source 2 explicitly lists “*78015” under Congressional District 23 with a split-population percentage and an asterisk indicating the ZIP is in more than one district, which logically entails that at least some portion of ZIP 78015's addresses/area is assigned to TX-23; Source 7 independently shows that some ZIP+4 addresses within 78015 return the TX-23 representative, reinforcing that the overlap is real rather than a mere cartographic guess. The opponent's critique correctly notes that ZIPs are postal constructs and that crosswalks are not pure boundary proofs, but given the claim's modest wording (“lies at least partly within”) and the direct split assignment evidence in Sources 2 and 7, the conclusion that 78015 overlaps TX-23 is logically supported and true.
Expert 2 — The Source Auditor
Source 2 (Texas Legislative Council, authority score ~0.95) is an official government document that explicitly lists ZIP code 78015 under Congressional District 23 with 67.0% of its split population (6,607 residents) within that district, directly confirming the claim. Source 7 (U.S. House of Representatives ZIP lookup, authority score ~0.90) further confirms that addresses within 78015 return TX-23 representative Tony Gonzales. Source 17 (Wikipedia on TX-21) explicitly notes Fair Oaks Ranch as 'part; also 23rd,' and Sources 9, 10, 11, 12, 13, 19, and 23 all corroborate that ZIP 78015 is split between Districts 21 and 23. The opponent's argument that Source 2 is merely a population crosswalk rather than a geographic boundary determination is technically pedantic — the claim only requires that 78015 lies 'at least partly' within TX-23, and the Texas Legislative Council's official district document listing 78015 under CD23 with a specific population count is authoritative confirmation of exactly that. The most reliable sources — official U.S. House and Texas Legislative Council documents — clearly and consistently confirm the claim that ZIP 78015 lies at least partly within Texas's 23rd congressional district.
Expert 3 — The Precision Analyst
The claim states that ZIP 78015 lies at least partly within Texas's 23rd district; Source 2 directly lists it with 67% of its split population in District 23 and an asterisk noting it spans multiple districts, while Source 7, Source 12, and Source 23 confirm partial assignment via official lookup and mapping data. This matches the claim's precise scope and qualifier without overstatement or missing baselines.