Electrical repair · San Marcos, Texas
Electrician for repairs and upgrades in San Marcos, TX
Breaker keeps tripping, outlets dead, planning a panel upgrade or EV charger? 14% of San Marcos's homes date from 1960–1979[1] and 7% from 2020 or later. Request a licensed electrician who works here. San Marcos, in Hays County and Caldwell County and Guadalupe County — ZIP 78666, counts 77,830 residents (2025 estimate)[2].
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San Marcos electrical snapshot: the key figures
- Population (2025 est.)
- 77,830[2]+14.9% since 2020
- County
- Hays / Caldwell / Guadalupe[2]city spans more than one county
- Land area
- 40.4 sq mi[3]
- Homes built 1960–1979
- 14%[1]the highest share of the 15 Austin-area suburbs we cover
- Homes built before 1960
- 9%[1]2020–2024
- Homes built 2020 or later
- 7%[1]2020–2024
- Homes heated with electricity
- 71%[1]the 4th-highest share of the 15 Austin-area suburbs we cover
- Lightning-damage reports within 10 mi
- 0[4]2016–2025
- Damaging-wind reports within 10 mi
- 35[4]2016–2025
- Winter-storm & freeze days, hays zone
- 19[4]2016–2025; ice storms knock out power — panel and generator readiness
What San Marcos's numbers say about electrical
San Marcos counts 77,830 residents (2025 estimate), growing at a middle-of-the-pack 14.9% since 2020[2]. The city spans 40.4 square miles at 1,925 residents per square mile (the 9th densest) and spans Hays County and Caldwell County and Guadalupe County, served by ZIP code 78666[3].
New construction arrives with 200-amp panels and room to grow; the older homes nearby are the ones where panels fill up, double-taps appear, and an EV charger triggers a load calculation.
One ZIP code covers the whole city: 78666[5].
Nearest of the other suburbs we track: Kyle (8.9 mi N), Buda (14.8 mi N) and Dripping Springs (24.2 mi NW)[3].
14% of San Marcos's housing was built in 1960–1979[1] — the highest share of the 15 Austin-area suburbs we cover; nearby, Kyle (2%), Buda (3%), and Dripping Springs (4%). That window includes roughly 1965–1973, when some homes got aluminum branch wiring[6].
71% of San Marcos homes heat with electricity and 26% with gas[1] — the 4th-highest share of the 15 Austin-area suburbs we cover (Kyle (51%), Buda (48%), and Dripping Springs (69%) nearby). All-electric panels carry the heaviest loads, so EV chargers here usually start with a load calculation.
Within 10 miles of central San Marcos: 35 damaging-wind reports and 0 lightning-damage reports in 2016–2025, the latest on May 26, 2025[4].
Ice is the other outage risk: 19 winter-storm, ice or hard-freeze days in 2016–2025[4] — worth knowing when sizing a generator or asking about whole-home surge protection.
7% of San Marcos's housing is from 2020 or later[1] — new enough that builder warranties still apply to many electrical defects.
Measured against the 15 suburbs on this site, San Marcos records the highest share of homes built 1960–79 (14%)[1], the fewest lightning-damage reports nearby (0, tied with Hutto and Dripping Springs)[4], the lowest share of detached houses (35%)[1], and the lowest median home value ($310,400)[1].
electrical help in San Marcos: what to do next
Electrical repair contractors taking requests around San Marcos cover ZIP code 78666.
Before you call: when to call an electrician now
Whose wiring is it? San Marcos homes by building type
62%[1] of San Marcos's homes are attached or in multi-unit buildings (multi-unit buildings alone: 58%, the highest multi-unit share of the 15 Austin-area suburbs we cover). In a condo or apartment the service entrance, meters and common-area wiring usually belong to the association or landlord, while work inside your unit is usually yours to arrange — check before you book.
After detached houses, the biggest group is 50 or more units: 5,330 of 30,349 housing units[1].
For San Marcos's 751 mobile homes (2.5%), ask for an electrician who works on manufactured homes.
| Building type | Units | Share | Margin of error |
|---|---|---|---|
| Detached house | 10,628 | 35.0% | ±747 |
| Attached house (townhouse, rowhouse) | 1,395 | 4.6% | ±373 |
| Duplex (2 units) | 1,141 | 3.8% | ±330 |
| 3–4 units | 2,239 | 7.4% | ±458 |
| 5–9 units | 2,336 | 7.7% | ±539 |
| 10–19 units | 3,601 | 11.9% | ±637 |
| 20–49 units | 2,906 | 9.6% | ±605 |
| 50 or more units | 5,330 | 17.6% | ±638 |
| Mobile home | 751 | 2.5% | ±212 |
| Boat, RV, van, etc. | 22 | 0.1% | ±37 |
Margins of error are the Census Bureau’s 90% intervals; small categories in small cities are rough.
The San Marcos numbers behind this page
| Measure | San Marcos | Median of 15 | Difference |
|---|---|---|---|
| Built before 1960 | 9.2% | 1.5% | 8 pts higher |
| Built 1960–79 | 14% | 3% | 11 pts higher |
| Lightning-damage reports (10 mi) | 0 | 1 | 1 fewer |
| Built 1980–99 | 25% | 13% | 12 pts higher |
| Owner-occupied | 31% | 69% | 39 pts lower |
| Detached single-family | 35% | 74% | 39 pts lower |
| Median home value | $310,400 | $420,000 | 26% lower |
Sorted by largest difference. Each median is the middle value across the covered Austin-area suburbs, from the same sources.
| City | Lightning reports | Damaging-wind reports | Freeze days |
|---|---|---|---|
| San Marcos | 0 | 35 | 19 |
| Kyle 8.9 mi | 1 | 29 | 19 |
| Buda 14.8 mi | 3 | 19 | 19 |
| Dripping Springs 24.2 mi | 0 | 8 | 19 |
| Bee Cave 30.0 mi | 2 | 26 | 22 |
| Lakeway 33.4 mi | 1 | 20 | 22 |
| Built | Units | Share | Margin of error |
|---|---|---|---|
| 2020 or later | 2,153 | 7.1% | ±467 |
| 2010 to 2019 | 7,830 | 25.8% | ±774 |
| 2000 to 2009 | 5,734 | 18.9% | ±792 |
| 1990 to 1999 | 3,327 | 11.0% | ±623 |
| 1980 to 1989 | 4,319 | 14.2% | ±725 |
| 1970 to 1979 | 2,839 | 9.4% | ±548 |
| 1960 to 1969 | 1,341 | 4.4% | ±344 |
| 1950 to 1959 | 1,357 | 4.5% | ±308 |
| 1940 to 1949 | 742 | 2.4% | ±319 |
| 1939 or earlier | 707 | 2.3% | ±237 |
ACS 2020–2024 estimates; margins of error are the Census Bureau's 90% intervals.
| Date | Wind | Distance |
|---|---|---|
| May 26, 2025 | 64 mph (est.) | 0.5 mi |
| May 23, 2025 | 64 mph (est.) | 9.0 mi |
| May 22, 2025 | 61 mph | 4.2 mi |
| May 9, 2024 | 70 mph (est.) | 3.4 mi |
| May 9, 2024 | 60 mph (est.) | 1.8 mi |
| May 9, 2024 | 70 mph (est.) | 6.0 mi |
| ZIP (ZCTA) | Share of San Marcos's land | Share of the ZIP inside the city |
|---|---|---|
| 78666 | 91% | 17% |
Dated heat and freeze records for the HAYS forecast zone: see the county list.
San Marcos electrical questions
Could my San Marcos house have aluminum wiring?
Possibly, if built or rewired roughly 1965–1973[6]; 14% of San Marcos homes date from 1960–1979[1].
When did damaging wind last hit near San Marcos?
May 26, 2025, 0.5 miles from the city center, 64 mph[4].
Which San Marcos ZIP codes are covered?
78666[5] — Hays County. Neighbouring suburbs with their own pages: Kyle (8.9 mi), Buda (14.8 mi), and Dripping Springs (24.2 mi)[3].
A lot of San Marcos homes predate 1980 — what does that mean for wiring and panel work?
23% of San Marcos's housing units were built before 1980, 9.2% before 1960[1] — the highest share of the 15 Austin-area suburbs we cover. Houses of that age may have smaller panels or original wiring; ask for a panel and grounding check before adding a big load such as an EV charger.
Sources
- Census ACS 2020–2024 5-year (keyless bulk)
- Census population estimates, Vintage 2025
- Census Gazetteer 2025
- NOAA Storm Events Database
- Census 2020 ZCTA–place file
- CPSC, Repairing Aluminum Wiring (link unverified)
Data pulled Sep 28, 2026. Full citations and method.