78666 — San Marcos, TX Home Values
Typical home value $315,964 as of June 2026 · 76th of 87 in Austin-Round Rock-Georgetown, TX
Blue: typical home value (Zillow ZHVI) in ZIP code 78666, June 2021 to June 2026. This page shows observed data only; no forecast.
How 78666 compares in the Austin-Round Rock-Georgetown, TX area
ZIP code 78666 (San Marcos, TX) has a typical home value of $315,964 as of June 2026, ranking 76th of 87 ZIP codes tracked in the Austin-Round Rock-Georgetown, TX area, more expensive than about 14% of ZIP codes in the metro. Prices here have moved -4.0% over the trailing 12 months. Over the past five years, the typical value in this ZIP code has changed -1.1%, from $319,542 in June 2021 to $315,964 in June 2026. Against observed rent, the typical home here sells for 18.9× the annual rent ($1,395/mo), a common way to gauge whether buying looks cheap relative to renting in this ZIP code.
Every figure above is observed Zillow data. Sialim's forecasting engine works at the metro level; see the Austin-Round Rock-Georgetown, TX forecast for a modeled outlook, or browse the full ranked list of ZIP codes in Austin.
Population and demographics
ZIP code 78666 has a population of 87,775, per the Census Bureau's American Community Survey 5-year estimate. By race and ethnicity: 44.6% White, 43.8% Hispanic or Latino, 5.1% Black or African American, 3.3% two or more races, 1.7% Asian, 1.2% another race, and 0.2% American Indian or Alaska Native.
Nearby public schools
| School | Address | Distance |
|---|---|---|
| CROCKETT EL | 1300 GIRARD ST, SAN MARCOS, TX | 1.4 mi |
| HERNANDEZ EL | 333 STAGECOACH TRL, SAN MARCOS, TX | 1.5 mi |
| MILLER MIDDLE | 301 FOXTAIL RUN, SAN MARCOS, TX | 1.8 mi |
Distance is straight-line from the ZIP code's center; driving distance will be longer. School attendance is set by district boundaries, not proximity. Confirm which school a specific address is zoned for with the local school district. Source: National Center for Education Statistics.
Frequently asked questions
What is the typical home value in ZIP code 78666?
$315,964 as of June 2026, the latest month Zillow has published observed data for.
Is 78666 an expensive ZIP code in the Austin-Round Rock-Georgetown, TX area?
78666 ranks 76th of 87 ZIP codes in the Austin-Round Rock-Georgetown, TX area by typical home value, more expensive than about 14% of ZIP codes in the metro.
How much have home values in 78666 changed over the past year?
-4.0% over the trailing 12 months, from observed Zillow data.
Is it cheaper to buy or rent in ZIP code 78666?
The typical home price is 18.9× the observed annual rent in this ZIP code ($1,395/mo). Lower multiples favor buying over renting, all else equal.
What is the population of ZIP code 78666?
87,775, per the US Census Bureau's American Community Survey 5-year estimate.
What are the closest public schools to ZIP code 78666?
CROCKETT EL (1.4 mi), HERNANDEZ EL (1.5 mi), MILLER MIDDLE (1.8 mi), by straight-line distance from the ZIP code's center. School attendance is set by district boundaries, not proximity. Confirm assignment with the local school district.
Is this page showing a forecast for 78666?
No. Every number on this page is observed Zillow data as of June 2026, not a forecast. Sialim's forecasting engine runs at the metro level; see the Austin-Round Rock-Georgetown, TX forecast for a modeled outlook.
ZIP-level values shown here are observed Zillow data, not forecasts. Sialim's forecasting engine works at the metro level today; ZIP-level forecasts are planned for Sialim Pro. Data © Zillow, via Zillow Research.