US ZIP Code Map

ZIP code

78666

San Marcos, TX

STANDARD

78666 covers San Marcos in Hays County, with 87,775 people in the ACS estimate.

Map of 78666, San Marcos

ZIP code map

ACS population

87,775

Median household income

$55,478

Median home value

$271,900

About ZIP code 78666

Type

STANDARD

City

San Marcos

County

Hays County

Timezone

America/Chicago

Area codes

512, 737, 830

Land area

192.4 sq mi

Water area

1.02 sq mi

Households

36,354

Median gross rent

$1,294

More enterprise fields

Timezone
America/Chicago
Area Codes
512, 737, 830
World Region
NA
Country
US
Housing Count
36,608
Irs Estimated Households
36,290
Population Count
86,584
Irs Estimated Population
59,940

People in 78666

Race

  • White47,756
  • Black or African American5,484
  • American Indian or Alaska Native836
  • Asian2,134
  • Native Hawaiian and Pacific Islander82
  • Other race11,737
  • Two or more races18,555

Hispanic or Latino (any race): 36,770

Age

  • Under 108,037
  • 10 to 1915,178
  • 20 to 2928,111
  • 30 to 399,533
  • 40 to 496,809
  • 50 to 596,732
  • 60 to 696,353
  • 70 to 793,960
  • 80 and older1,871

Income and housing in 78666

Poverty rate

23.3%

Median earnings

$25,890

Median household income

$55,478

Median home value

$271,900

Median gross rent

$1,294

Education

  • High school graduate89.3%
  • Bachelor's degree34.6%
  • Graduate degree14.1%

Places covering 78666

Cities and places

17.3% of this ZIP is outside city limits (a real overlap row, not missing data).

Population history for 78666

IRS populationACS population
94,79747,399020052023

Hover a year for IRS and ACS values.

ZIP codes near 78666

  1. 78667San Marcos0.0 miPop 1,571 · Income —
  2. 78655Martindale5.5 miPop 3,687 · Income $48,409
  3. 78656Maxwell6.7 miPop 2,953 · Income $78,058
  4. 78640Kyle8.2 miPop 71,460 · Income $88,533
  5. 78670Staples9.3 miPop 178 · Income $76,591
  6. 78622Fentress12.3 miPop 353 · Income $72,941
  7. 78676Wimberley13.2 miPop 15,896 · Income $86,819
  8. 78661Prairie Lea14.1 miPop 658 · Income $47,917
  9. 78610Buda14.8 miPop 46,685 · Income $110,417
  10. 78644Lockhart15.0 miPop 20,599 · Income $72,155
  11. 78115Geronimo15.4 miPop 417 · Income —
  12. 78130New Braunfels16.9 miPop 95,787 · Income $84,426

ZIP code 78666 FAQ

What city is ZIP code 78666 in?
78666 is in San Marcos, TX.
What county is 78666 in?
78666 is in Hays County.
What is the median household income in 78666?
The median household income in 78666 is $55,478.
Which ZIP codes are near 78666?
Use the radius tool on this page to list ZIP codes within a chosen distance of 78666.