ZIP codes
2
San Marcos, TX Demographics & ZIP Codes
San Marcos, Texas demographics and median household income by ZIP code (in Caldwell County, Hays County) — 2 ZIP codes — population 90,728 — median income $66,768 — avg. home value $233,400. Compare income, housing, and population across ZIP codes on US5.
Population
90,728
Median household income (avg.)
$66,768
89% of U.S. median
Average home value
$233,400
67% of U.S. median
Average rent
$1,144
98% of U.S. median
Median age (avg.)
29.8
San Marcos demographics
San Marcos, Texas covers 2 ZIP codes spanning Caldwell County and Hays County, with a combined ZIP-area population of about 90,728.
Across ZIP codes with age data, the average median age is about 29.8 years.
Median household income in San Marcos
The average median household income across ZIP codes in San Marcos, Texas is about $66,768 — about 9% below the TX ZIP average ($73,553), and about 11% below the U.S. median ($75,149).
Among ZIPs with income data, 78656 is near the top at about $78,058, while 78666 is near the bottom at about $55,478.
Housing in San Marcos
For housing in San Marcos, Texas, the average median home value is about $233,400 and the average median rent is about $1,144.
The most populous ZIP in this set is 78666 (about 87,775 residents). Use the table below to compare population, income, and home values across codes.
ZIP codes in San Marcos
Sort by population, income, or home value. Click a column header to toggle ascending / descending.
| ZIP | City | County | State | Population ↓ | Income | Home value |
|---|---|---|---|---|---|---|
| 78666 | San Marcos | Hays County | TX | 87,775 | $55,478 | $271,900 |
| 78656 | San Marcos | Caldwell County | TX | 2,953 | $78,058 | $194,900 |
Frequently asked questions
What are the demographics of San Marcos?
San Marcos, Texas has a combined ZIP-area population of about 90,728 across 2 ZIP codes (primarily Caldwell County, Hays County). Browse the ZIP table below for population, income, and housing by code.
What is the median household income in San Marcos?
The average median household income across ZIP codes in San Marcos, Texas is about $66,768, about 9% below the state ZIP average ($73,553), and about 11% below the U.S. median ($75,149). Average median home value is about $233,400. Among ZIPs with data, 78656 is near the top ($78,058) and 78666 is near the bottom ($55,478).
How many ZIP codes are in San Marcos?
San Marcos, Texas includes 2 ZIP codes on US5. Each row links to demographics, median income, and housing for that code.
Where can I find ZIP code demographics for San Marcos?
This page lists ZIP codes in San Marcos, Texas with population, median household income, and home value. Select a ZIP for a full demographics profile.