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ZIP Code 78666
San Marcos, TX, Hays County
Population
88,583
Land area
192.4sq mi
People per sq mi
460
City
San Marcos
ZIP 78666 and nearby ZIP codes
ZIP 78666 at a glance
- ZIP 78666 (San Marcos) is about 4 times as dense as Texas as a whole.
- Households here earn a median of $54,737 a year, 30% less than the Texas figure of $78,476.
- A typical owner-occupied home is valued at $306,700 (8% above Texas) and median rent is $1,319 a month.
Local data for ZIP 78666
Counts from official public data
- Hospitals1
- Emergency Rooms1
- Nursing Homes3
- Schools20
- Colleges2
- Libraries1
- Banks16
- Post Offices3
- Parks39
- Grocery Stores25
- Restaurants367
- Affordable Housing2
- Home Health Agencies1
- Hospice Care4
- Dialysis Centers1
- Community Health Centers2
- Mental Health & Addiction Treatment3
- Private Schools5
- Community Colleges & Trade Schools1
- Toxic Release Facilities4
Housing and community stats
ZIP 78666, American Community Survey 2020-2024
Median household income
$54,737
Poverty rate
23.8%
Median home value
$306,700
Prices -1.7% in a year
Median rent
$1,319/mo
Homeownership
38.1%
Bachelor's or higher
35.7%
Median age
26.9
Average commute
25.5 min
Economy and federal money
Businesses, pandemic loans and political donations
Business establishments
1,880
ZIP Business Patterns 2023
Employees
34,315
$1.6B annual payroll
PPP loans
$110M
1,642 loans
Campaign donations
$398K
26% D, 33% R, 2026 cycle
Environment and hazard risk
ZIP 78666, from FEMA, NOAA and EPA
Natural hazard risk
Relatively Moderate
Top: hail
Storm events since 1996
495
Countywide, mostly hail
Flood insurance policies
1,620
2.3% of homes, county
July high / Jan low
96° / 39°F
36.6 inches of rain a year
Health statistics
Share of adults in ZIP 78666, CDC PLACES estimates
Obesity
34.4%
U.S. 33.3% +1.1 pts
Diabetes
9.3%
U.S. 12.1% -2.8 pts
Smoking
11.4%
U.S. 12.8% -1.4 pts
Uninsured (18-64)
20.1%
U.S. 11.1% +9.0 pts
Frequently asked questions
- What city is ZIP code 78666?
- ZIP code 78666 is in San Marcos, TX (Hays County).
- What county is ZIP code 78666 in?
- ZIP code 78666 is mostly in Hays County, Texas.
- How many people live in ZIP code 78666?
- About 88,583 people live in the 78666 ZIP Code Tabulation Area, based on American Community Survey 5-year estimates.
Source: U.S. Census Bureau (ZIP Code Tabulation Areas, American Community Survey) · Data as of 12/31/2023. ZIP Code Tabulation Areas closely match, but are not identical to, USPS ZIP code delivery areas.