ZIP 78666 · San Marcos
Who lives in ZIP code 78666 (San Marcos, TX): age, income, housing, education and work.
Source: uszips 2026 (ACS-based ZIP file)
2026 ZIP profile
San Marcos, TX · Hays County
uszips 2026
People88,583
Median age26.9
Household income$54,737
Home value$301,523
Median rent$1,319/mo
Poverty23.8%
College degree+35.6%
Commute26 min
Place
- Metro area
- Austin-Round Rock-San Marcos, TX
- Time zone
- Central
- Density
- 178 / sq mi
- Housing units
- 33,949
Spans 4 counties
Share of the ZIP's people in each county.
Age mix
12.0% are 65 or older; 85.8% are adults.
Household income
23.1% of households earn $100K+. Median per person: $26,552.
Education (adults 25+)
41.8% of degrees are in STEM fields.
Race
44.3% Hispanic or Latino (of any race).
Households & family
- Married
- 31.4%
- Never married
- 55.1%
- Divorced
- 10.2%
- Widowed
- 3.4%
- Family size
- 2.98
- Dual-income families
- 54.7%
Housing
- Own their home
- 38.1%
- Rent burden
- 37.3%
- Men / women
- 48% / 52%
Work
- In labor force
- 65.4%
- Unemployment
- 5.2%
- Self-employed
- 11.2%
- Farmers
- 0.8%
Community
- Charitable givers
- 9.6%
- Veterans
- 5.0%
- With a disability
- 15.6%
- No health insurance
- 16.6%
- Limited English
- 1.9%
Source: uszips 2026 (ACS-based ZIP file). Shares are percentages of people, households or adults as the measure implies.