78666 ZIP Code
San Marcos, Texas
December 30, 2025
| ZIP Code: | 78666 |
| City/Town: | San Marcos |
| County: | Hays |
| State: | Texas |
| ZIP Type: | Standard |
| Population: | 86,530 |
| Median Household Income: | $52,432 |
| Per Capita Income: | $24,857 |
| Total Housing Units: | 35,923 |
| Median Home Value: | $248,700 |
| Land Area: | 192.4 sq miles
498.2 sq km |
| Water Area: | 1.0 sq miles
2.6 sq km |
| Coordinates: | 29.8817, -97.9848 |
Population Information (78666 zip code)
| Number# | Percent% | US AvgUS | |
|---|---|---|---|
| Total Population: | 86,530 | -- | -- |
| Male: | 42,121 | 48.7% | 49.6% |
| Female: | 44,409 | 51.3% | 50.4% |
| Median Age: | 26.5 yrs | -- | 38.5 yrs |
| Under 5 years: | 3,411 | 3.9% | 5.7% |
| 5 to 9 years: | 3,033 | 3.5% | 6.0% |
| 10 to 14 years: | 3,674 | 4.2% | 6.5% |
| 15 to 19 years: | 9,221 | 10.7% | 6.6% |
| 20 to 24 years: | 20,356 | 23.5% | 6.7% |
| 25 to 34 years: | 13,896 | 16.1% | 13.7% |
| 35 to 44 years: | 9,387 | 10.8% | 12.9% |
| 45 to 54 years: | 6,982 | 8.1% | 12.4% |
| 55 to 59 years: | 3,231 | 3.7% | 6.5% |
| 60 to 64 years: | 3,905 | 4.5% | 6.4% |
| 65 to 74 years: | 5,968 | 6.9% | 9.7% |
| 75 to 84 years: | 2,355 | 2.7% | 4.8% |
| 85 years and over: | 1,111 | 1.3% | 2.0% |
Housing Information (78666 zip code)
| Number# | Percent% | US AvgUS | |
|---|---|---|---|
| Median home value: | $248,700 | -- | $281,900 |
| Median rooms: | 4.7 | -- | 5.5 |
| Median rent: | $1,245 / mo. | -- | $1,268 / mo. |
| Total housing units: | 35,923 | -- | -- |
| Occupied housing units: | 33,173 | 92.3% | 38.0% |
| Vacant housing units: | 2,750 | 7.7% | 4.6% |
| Housing tenure: | -- | -- | -- |
| Owner-occupied: | 12,400 | 37.4% | 64.8% |
| Renter-occupied: | 20,773 | 62.6% | 35.2% |
Educational Attainment (78666 zip code)
| Number# | Percent% | US AvgUS | |
|---|---|---|---|
| Population 25 years and over: | 46,835 | -- | -- |
| Less than 9th grade: | 2,455 | 5.2% | 4.7% |
| 9th to 12th grade, no diploma: | 3,009 | 6.4% | 6.1% |
| High school graduate: | 11,719 | 25.0% | 26.4% |
| Some college, no degree: | 11,018 | 23.5% | 19.7% |
| Associate degree: | 3,040 | 6.5% | 8.7% |
| Bachelor's degree: | 9,488 | 20.3% | 20.9% |
| Graduate or professional degree: | 6,106 | 13.0% | 13.7% |
| Percent high school graduate or higher: | -- | 88.3% | 89.1% |
| Percent bachelor's degree or higher: | -- | 33.3% | 34.3% |
Income Information (78666 zip code)
| Value | US AvgUS | |
|---|---|---|
| Median household income: | $52,432 / yr. | $75,149 / yr. |
| Mean household income: | $68,664 / yr. | $105,833 / yr. |
| Median family income: | $65,984 / yr. | $92,646 / yr. |
| Per capita income: | $24,857 / yr. | $41,261 / yr. |
Employment (78666 zip code)
| Number# | Percent% | US AvgUS | |
|---|---|---|---|
| In labor force: | 49,498 | -- | 63.5% |
| Employed: | 46,157 | 93.6% | 96.4% |
| Unemployed: | 3,136 | 6.4% | 5.3% |
| Not in labor force: | 26,129 | -- | -- |
| Class of Worker: | -- | -- | -- |
| Private wage and salary: | 35,141 | 76.1% | 79.7% |
| Government workers: | 8,500 | 18.4% | 14.2% |
| Self-employed: | 2,482 | 5.4% | 5.9% |
| Unpaid family workers: | 34 | 0.1% | 0.1% |
Race & Ethnicity (78666 zip code)
| Number# | Percent% | US AvgUS | |
|---|---|---|---|
| Race (one race): | -- | -- | -- |
| White: | 58,603 | 67.7% | 61.6% |
| Black or African American: | 4,807 | 5.6% | 12.4% |
| American Indian/Alaska Native: | 331 | 0.4% | 1.1% |
| Asian: | 1,594 | 1.8% | 6.0% |
| Native Hawaiian/Pacific Islander: | 65 | 0.1% | 0.2% |
| Some other race: | 5,976 | 6.9% | 8.4% |
| Two or more races: | 15,154 | 17.5% | 10.2% |
| Hispanic or Latino (any race): | 18,518 | 21.4% | 18.7% |
| Mexican: | 37,942 | 43.8% | 11.2% |
| Puerto Rican: | 32,185 | 37.2% | 1.8% |
| Cuban: | 681 | 0.8% | 0.7% |
| Other Hispanic or Latino: | 139 | 0.2% | 5.0% |
| Not Hispanic or Latino: | 4,937 | 5.7% | 81.1% |
Income Distribution (78666 zip code)
| Household Income | Households | Percent% | US AvgUS |
|---|---|---|---|
| Less than $10,000: | 3,135 | 9.5% | 4.9% |
| $10,000 to $14,999: | 1,711 | 5.2% | 3.8% |
| $15,000 to $24,999: | 2,844 | 8.6% | 7.0% |
| $25,000 to $34,999: | 3,959 | 11.9% | 7.4% |
| $35,000 to $49,999: | 4,202 | 12.7% | 10.7% |
| $50,000 to $74,999: | 7,126 | 21.5% | 16.1% |
| $75,000 to $99,999: | 3,664 | 11.0% | 12.8% |
| $100,000 to $149,999: | 3,437 | 10.4% | 17.1% |
| $150,000 to $199,999: | 1,210 | 3.6% | 8.8% |
| $200,000 or more: | 1,885 | 5.7% | 11.4% |
Commute to Work (78666 zip code)
| Commute Method | Workers | Percent% | US AvgUS |
|---|---|---|---|
| Drove alone: | 33,563 | 72.7% | 67.8% |
| Carpooled: | 4,815 | 10.4% | 8.7% |
| Public transportation: | 375 | 0.8% | 4.2% |
| Walked: | 1,910 | 4.1% | 2.5% |
| Other means: | 1,286 | 2.8% | 0.9% |
| Worked from home: | 3,724 | 8.1% | 13.8% |
| Mean travel time to work: | 24.6 min | -- | 26.7 min |
Industry (78666 zip code)
| Industry Sector | Workers | Percent% | US AvgUS |
|---|---|---|---|
| Agriculture, forestry, fishing, mining: | 442 | 1.0% | 1.6% |
| Construction: | 3,266 | 7.1% | 6.9% |
| Manufacturing: | 2,328 | 5.0% | 10.0% |
| Wholesale trade: | 941 | 2.0% | 2.4% |
| Retail trade: | 6,769 | 14.7% | 11.0% |
| Transportation, warehousing, utilities: | 2,860 | 6.2% | 5.8% |
| Information: | 594 | 1.3% | 1.9% |
| Finance, insurance, real estate: | 1,885 | 4.1% | 6.7% |
| Professional, scientific, management: | 4,539 | 9.8% | 12.1% |
| Education, health care, social services: | 11,326 | 24.5% | 23.3% |
| Arts, entertainment, food services: | 7,278 | 15.8% | 9.0% |
| Other services: | 2,186 | 4.7% | 4.7% |
| Public administration: | 1,743 | 3.8% | 4.7% |
Poverty Status (78666 zip code)
| Number# | Percent% | US AvgUS | |
|---|---|---|---|
| Poverty Rate: | -- | 24.4% | 8.8% |
| All people below poverty level: | -- | -- | -- |
| Under 18 years: | -- | -- | 16.3% |
| 18 to 64 years: | -- | -- | 11.0% |
| 65 years and over: | -- | -- | 10.3% |
Health Insurance (78666 zip code)
| Number# | Percent% | US AvgUS | |
|---|---|---|---|
| With health insurance: | 71,325 | 82.4% | 91.3% |
| Private health insurance: | 59,223 | 68.4% | 67.6% |
| Public health coverage: | 19,451 | 22.5% | 35.9% |
| Without health insurance: | 14,102 | 16.3% | 8.7% |
Benefits & Assistance (78666 zip code)
| Households with: | Number# | Percent% | US AvgUS |
|---|---|---|---|
| Earnings: | 27,752 | 83.7% | 77.4% |
| Social Security income: | 5,988 | 18.1% | 31.0% |
| Retirement income: | 5,084 | 15.3% | 21.8% |
| Supplemental Security Income (SSI): | 1,029 | 3.1% | 4.5% |
| Cash public assistance income: | 998 | 3.0% | 1.8% |
| SNAP (food stamps) benefits: | 2,671 | 8.1% | 11.4% |
Housing Types (78666 zip code)
| Structure Type | Units | Percent% | US AvgUS |
|---|---|---|---|
| 1-unit, detached: | 13,976 | 38.9% | 61.4% |
| 1-unit, attached: | 836 | 2.3% | 6.1% |
| 2 units: | 1,163 | 3.2% | 3.4% |
| 3 or 4 units: | 2,877 | 8.0% | 4.3% |
| 5 to 9 units: | 2,227 | 6.2% | 4.6% |
| 10 to 19 units: | 4,348 | 12.1% | 4.3% |
| 20 or more units: | 7,337 | 20.4% | 9.9% |
| Mobile home: | 3,152 | 8.8% | 5.8% |
| Boat, RV, van, etc.: | 7 | 0.0% | 0.1% |
Year Structure Built (78666 zip code)
| Year Built | Units | Percent% | US AvgUS |
|---|---|---|---|
| Built 2020 or later: | 675 | 1.9% | 0.6% |
| Built 2010 to 2019: | 8,227 | 22.9% | 8.2% |
| Built 2000 to 2009: | 6,855 | 19.1% | 13.5% |
| Built 1990 to 1999: | 5,787 | 16.1% | 13.2% |
| Built 1980 to 1989: | 5,795 | 16.1% | 13.2% |
| Built 1970 to 1979: | 3,910 | 10.9% | 14.6% |
| Built 1960 to 1969: | 1,665 | 4.6% | 10.2% |
| Built 1950 to 1959: | 1,330 | 3.7% | 9.9% |
| Built 1940 to 1949: | 868 | 2.4% | 4.6% |
| Built 1939 or earlier: | 811 | 2.3% | 12.0% |
Bedrooms (78666 zip code)
| Number of Bedrooms | Units | Percent% | US AvgUS |
|---|---|---|---|
| No bedroom (studio): | 1,106 | 3.1% | 2.4% |
| 1 bedroom: | 5,355 | 14.9% | 3.0% |
| 2 bedrooms: | 10,314 | 28.7% | 9.1% |
| 3 bedrooms: | 13,592 | 37.8% | 15.9% |
| 4 bedrooms: | 5,100 | 14.2% | 18.8% |
| 5 or more bedrooms: | 456 | 1.3% | 17.6% |
Heating Fuel (78666 zip code)
| Fuel Type | Units | Percent% | US AvgUS |
|---|---|---|---|
| Utility gas: | 6,846 | 20.6% | 47.1% |
| Bottled, tank, or LP gas: | 816 | 2.5% | 4.9% |
| Electricity: | 25,312 | 76.3% | 40.2% |
| Fuel oil, kerosene, etc.: | 0 | 0.0% | 4.2% |
| Coal or coke: | 0 | 0.0% | 0.1% |
| Wood: | 76 | 0.2% | 1.5% |
| Solar energy: | 41 | 0.1% | 0.1% |
| Other fuel: | 35 | 0.1% | 0.5% |
| No fuel used: | 47 | 0.1% | 0.2% |
Vehicles Available (78666 zip code)
| Vehicles | Households | Percent% | US AvgUS |
|---|---|---|---|
| No vehicle available: | 1,633 | 4.9% | 8.3% |
| 1 vehicle available: | 11,202 | 33.8% | 32.6% |
| 2 vehicles available: | 13,007 | 39.2% | 37.0% |
| 3 or more vehicles available: | 7,331 | 22.1% | 22.1% |
Home Value Distribution (78666 zip code)
| Value Range | Owner Units | Percent% | US AvgUS |
|---|---|---|---|
| Less than $50,000: | 1,081 | 8.7% | 5.7% |
| $50,000 to $99,999: | 803 | 6.5% | 7.8% |
| $100,000 to $149,999: | 1,167 | 9.4% | 9.2% |
| $150,000 to $199,999: | 1,754 | 14.1% | 10.8% |
| $200,000 to $299,999: | 3,249 | 26.2% | 19.9% |
| $300,000 to $499,999: | 3,411 | 27.5% | 24.1% |
| $500,000 to $999,999: | 827 | 6.7% | 17.0% |
| $1,000,000 or more: | 108 | 0.9% | 5.6% |
Housing Costs (78666 zip code)
| Value | US AvgUS | |
|---|---|---|
| Median owner costs (with mortgage): | $1,699 / mo. | $1,828 / mo. |
| Median owner costs (no mortgage): | $604 / mo. | $584 / mo. |
| Median gross rent: | $1,245 / mo. | $1,268 / mo. |
| Average household size (owner-occupied): | 2.61 | 2.53 |
| Average household size (renter-occupied): | 2.21 | 2.38 |
Households (78666 zip code)
| Number# | Percent% | US AvgUS | |
|---|---|---|---|
| Total households: | 33,173 | -- | -- |
| Married-couple households: | 11,186 | 33.7% | 47.5% |
| Cohabiting couple households: | 3,674 | 11.1% | 7.0% |
| Male householder, no spouse: | 7,736 | 23.3% | 5.4% |
| Female householder, no spouse: | 10,976 | 33.1% | 12.7% |
| Householder living alone: | 6,701 | 20.2% | 28.6% |
| 65 years and over living alone: | 6,190 | 18.7% | 11.8% |
| Average household size: | 2.36 | -- | 2.53 |
| Average family size: | 2.96 | -- | -- |
Marital Status (78666 zip code)
| Population 15 years and over | Number# | Percent% | US AvgUS |
|---|---|---|---|
| Total: | 36,952 | -- | -- |
| Never married: | 20,720 | 56.1% | 37.0% |
| Now married: | 12,390 | 33.5% | 49.5% |
| Separated: | 553 | 1.5% | 1.5% |
| Widowed: | 2,870 | 7.8% | 2.6% |
| Divorced: | 20,804 | 56.3% | 9.3% |
School Enrollment (78666 zip code)
| Population 3 years and over | Number# | Percent% | US AvgUS |
|---|---|---|---|
| Enrolled in school: | 33,556 | -- | -- |
| Nursery school, preschool: | 468 | 1.4% | 5.8% |
| Kindergarten: | 721 | 2.1% | 5.0% |
| Elementary school (grades 1-8): | 4,951 | 14.8% | 40.5% |
| High school (grades 9-12): | 3,850 | 11.5% | 21.4% |
| College or graduate school: | 23,566 | 70.2% | 27.3% |
Veterans & Disability (78666 zip code)
| Number# | Percent% | US AvgUS | |
|---|---|---|---|
| Civilian population 18 years and over: | 73,965 | -- | -- |
| Veterans: | 3,401 | 4.6% | 6.3% |
| Civilian noninstitutionalized population: | 85,427 | -- | -- |
| With a disability: | 11,816 | 13.8% | 13.4% |
| Under 18 with disability: | 930 | 7.9% | 5.8% |
| 18 to 64 with disability: | 7,194 | 60.9% | 10.4% |
| 65 and over with disability: | 3,692 | 31.2% | 33.4% |
Mobility (Residence 1 Year Ago) (78666 zip code)
| Population 1 year and over | Number# | Percent% | US AvgUS |
|---|---|---|---|
| Same house: | 60,886 | 70.4% | 86.9% |
| Different house: | 25,007 | 28.9% | 13.1% |
| Same county: | 10,692 | 42.8% | 7.0% |
| Different county: | 13,910 | 55.6% | 3.2% |
| Different state: | 1,702 | 6.8% | 2.5% |
| Abroad: | 405 | 1.6% | 0.4% |
Place of Birth (78666 zip code)
| Number# | Percent% | US AvgUS | |
|---|---|---|---|
| Native born: | 79,422 | 91.8% | 86.2% |
| Foreign born: | 969 | 1.1% | 13.9% |
| Naturalized citizen: | 7,108 | 733.5% | 52.7% |
| Not a citizen: | 7,108 | 733.5% | 47.3% |
| Foreign-born by region: | -- | -- | -- |
| Europe: | 7,108 | 733.5% | 10.5% |
| Asia: | 463 | 47.8% | 31.3% |
| Africa: | 267 | 27.6% | 5.5% |
| Oceania: | 0 | 0.0% | 0.5% |
| Latin America: | 4,248 | 438.4% | 50.0% |
| Northern America: | 181 | 18.7% | 2.2% |
Language Spoken at Home (78666 zip code)
| Population 5 years and over | Number# | Percent% | US AvgUS |
|---|---|---|---|
| Total: | 83,119 | -- | -- |
| English only: | 59,110 | 71.1% | 78.3% |
| Language other than English: | 24,009 | 28.9% | 21.5% |
| By language: | -- | -- | -- |
| Spanish: | 21,001 | 25.3% | 13.3% |
| Other Indo-European languages: | 1,848 | 2.2% | 3.5% |
| Asian/Pacific Island languages: | 855 | 1.0% | 3.5% |
| Other languages: | 305 | 0.4% | 1.0% |
Computers & Internet (78666 zip code)
| Households | Percent% | US AvgUS | |
|---|---|---|---|
| Households with a computer: | 33,173 | 100.0% | 93.1% |
| Households with broadband internet: | 31,774 | 95.8% | 89.4% |
San Marcos, TX78666