ZIP Code 78666 - San Marcos Texas

ZIP Code 78666 is located in San Marcos Texas. Portions of 78666 are also in Kyle and Redwood and Canyon Lake and Wimberley. 78666 is primarily within Hays County, with some portions in Guadalupe County and Comal County. Regionally, it is located in Metro Austin.

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ZIP Code 78666 Quick Stats

ZIP Code NameSan Marcos
Primary CountyHays County
ZIP Code TypeStandard
Population (2022)86,530
Area Code(s)512 / 737 / 830
Current Time

ZIP Code 78666 Map

78666 Demographics

78666 can be classified socioeconomically as Lower Middle Class class compared to other ZIP Codes in Texas based on Median Household Income and Average Adjusted Gross Income. The majority race/ethnicity residing in 78666 is White. The majority race/ethnicity attending public schools in 78666 is Hispanic. The current unemployment level in 78666 is 3.0%.

Population Growth Rate8.41%
Population Density469 People per Square Mile
Total Households22,018
Percentage High Income Households1.5%
Median Household Income (2021)$44,914
Average Adjusted Gross Income (2020)$51,010
Current Unemployment Rate (April 2024)3.0%
Majority Race/EthnictyWhite - 58.63%
Public School Majority Race/EthnictyHispanic - 72.11%

78666 Race/Ethnicty Breakdown

Native American3040.29%
Hawaiian/Pac. Islander550.05%

78666 Public School Race/Ethnicty Breakdown

Native American170.19%
Hawaiian/Pac. Islander140.16%

78666 Educational Attainment Levels

Highest Education Level AttainedTotalPercentage
Less Than 1 Year of College1,5756.25%
Bachelor Degree6,46125.64%
High School Diploma5,48121.75%
No High School Diploma4471.77%
GED or Alternate1,5626.2%
1 or More Years of College5,27420.93%
Associates Degree1,7717.03%
Masters Degree1,8977.53%
Professional Degree2460.98%
Doctorate Degree4871.93%

78666 Geography

Adjacent ZIP Codes
Cities/Towns in 78666
RegionsMetro Austin
Metro San Antonio
Metropolitan/Micropolitan Stat AreasAustin-Round Rock-Georgetown, TX
San Antonio-New Braunfels, TX
Time ZoneCentral Daylight Time
IANA TimezoneAmerica/Chicago
Area184 Square Miles

78666 Politics

US Congressional Districts in 78666
Texas State Senate Districts in 78666
Texas State House of Representatives Districts in 78666

78666 Weather and Climate Data

Plant Hardiness ZoneZone 8b: 15F to 20F
Average First Frost DateNovember 21 - 31
Average Last Frost DateMarch 11 - 20
Koppen-Geiger Climate ZoneCfa - Humid Subtropical Climate
Ecoregion32a - Northern Blackland Prairie

78666 Annual Climate Data

Avg Min Temp (°F)38414956657173736858484057
Avg Max Temp (°F)61667379869195959082716379
Avg Precip (In.)

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