ZIP profile
ZIP code 78666 is located around San Marcos, Texas in Hays County with an estimated population of 88,583 and a median household income of $54,737.
Population
88.6K
Estimated resident population.
Median income
$54,737
Estimated median household income.
Median rent
$1,319
Estimated median gross rent.
Median home value
$306,700
Estimated owner-occupied home value.
ZIP essentials
Population density
Estimated residents per square mile of land area in this ZIP tabulation area.
Housing density
Estimated housing units per square mile of land area in this ZIP tabulation area.
Demographics and housing
Households
Estimated number of occupied households in this ZIP tabulation area.
Owner occupied
Share of occupied housing units that are owner occupied.
Renter occupied
Share of occupied housing units that are renter occupied.
Education, work, and connectivity
Based on Census ACS 2024 5-year estimates. Tap the ? next to a metric for the denominator or calculation.
Bachelor's degree+
Share of residents age 25 and older with a bachelor's, graduate, or professional degree.
Poverty rate
Share of people whose income falls below the federal poverty threshold.
Labor force participation
Share of residents age 16 and older who are working or actively looking for work.
Age mix
Under 18
Share of residents younger than 18.
Age 20 to 34
Share of residents in the combined 20 to 24 and 25 to 34 age groups.
Age 35 to 64
Share of residents in the combined 35 to 44, 45 to 54, 55 to 59, and 60 to 64 age groups.
Housing stock and commute modes
Single-unit homes
Share of housing units in detached or attached single-unit structures.
Multi-unit housing
Share of housing units in buildings with 2 or more units.
Mobile homes
Share of housing units that are mobile homes.
Context
Rankings
Population rank
#19 of 1,992
Among ZIP codes in Texas with reported population.
Income rank
#1362 of 1,748
Among ZIP codes in Texas with reported median income.
Home value rank
#420 of 1,703
Among ZIP codes in Texas with reported home values.
Nearby ZIP codes
Quick take
Median household income is about 30% below the state median.
Poverty is higher than the state average by about 10 points.
Population density is relatively low at about 460 residents per square mile.
Location note
ZIP boundaries, mailing cities, and county lines do not always match perfectly. This page blends postal context, map context, and public demographic data so you can read the area more accurately.
Median age
Median resident age. Half of residents are younger and half are older.
Housing units
Estimated total housing units, whether occupied or vacant.
Vacancy rate
Share of housing units that are vacant.
Geography and density
Land area
Land area from Census TIGER ZCTA geometry.
Water area
Water area from Census TIGER ZCTA geometry.
Population density
Estimated residents per square mile of land area.
Housing density
Estimated housing units per square mile of land area.
Unemployment
Share of the civilian labor force age 16 and older that is unemployed.
Broadband households
Share of households with a broadband internet subscription.
Mean commute
Average one-way commute time for workers age 16 and older who do not work from home.
Community profile
Disability
Share of the civilian noninstitutionalized population with a disability.
Veterans
Share of the adult civilian population that served in the U.S. armed forces.
Foreign born
Share of residents born outside the United States.
Age 65+
Share of residents age 65 and older.
Race, ethnicity, and language
Race, ethnicity, and language do not share the same denominator, so these rows are not expected to sum to 100%.
White alone
Share of residents reporting White alone, not in combination with another race.
Black alone
Share of residents reporting Black or African American alone.
Hispanic or Latino
Share of residents identifying as Hispanic or Latino. This is an ethnicity and can overlap with race categories.
Asian alone
Share of residents reporting Asian alone.
Two or more races
Share of residents reporting more than one race.
English only
Share of people age 5 and older who speak only English at home.
Spanish
Share of people age 5 and older who speak Spanish at home.
Other languages
Share of people age 5 and older who speak a non-English, non-Spanish language at home.
Built 2010 or later
Share of housing units built in 2010 or later.
Built 1979 or earlier
Share of housing units built in 1979 or earlier.
Drive alone
Share of workers age 16 and older who usually drive alone to work.
Carpool
Share of workers age 16 and older who usually carpool to work.
Transit
Share of workers age 16 and older who usually use public transportation to work.
Walk
Share of workers age 16 and older who usually walk to work.
Work from home
Share of workers age 16 and older who usually work from home.
Start with a street address when you need the exact postal ZIP and ZIP+4.
Map
Interactive boundary map for ZIP 78666, with nearby ZIP coverage for local context. Click a nearby outline to open that ZIP page.