ZIP Code 78666, Texas
ZIP Code 78666 profile, demographic data, and geographic information.
ZCTA5 78666 is a 5-digit ZIP Code area located in Caldwell County / Comal County / Guadalupe County / Hays County, Texas. As of official census estimates, it has a reported population of 88,583. The land area covers 192.36 sq mi. [1]
Demographics & Population
| Demographic Metric | Estimate / Count | Margin of Error | Survey Period / Source |
|---|---|---|---|
| Total Population | 88,583 | ±1,333 | 2020-2024 / Census ACS 5-Year 2024 |
| Median Age | 26.9 yrs | ±0.6 | 2020-2024 / Census ACS 5-Year 2024 |
| Total Households | 33,949 | ±943 | 2020-2024 / Census ACS 5-Year 2024 |
Source: U.S. Census Bureau (PEP, ACS 5-Year).
Housing & Real Estate Profile
| Housing Metric | Estimate / Value | Margin of Error |
|---|---|---|
| Total Housing Units | 36,580 | ±856 |
| Occupied Housing Units | 33,949 | ±943 |
| Vacant Housing Units | 2,631 | ±528 |
| Median Home Value | $306,700 | ±$19,023 |
| Median Gross Rent | $1,319 | ±$39 |
Source: U.S. Census Bureau ACS 5-Year (2020-2024).
Economy & Workforce
| Economic Metric | Estimate / Value | Margin of Error |
|---|---|---|
| Median Household Income | $54,737 | ±$3,230 |
| Per Capita Income | $29,465 | ±$1,493 |
| Poverty Rate | 23.8% | ±1.9% |
| Population Below Poverty Level | 19,356 | ±1,605 |
| Unemployment Rate | 5.2% | ±1.1% |
| Civilian Labor Force, Employed | 48,041 | ±1,746 |
| Broadband Internet Rate | 86.4% | ±1.9% |
Source: U.S. Census Bureau ACS 5-Year (2020-2024).
Local Government & Public Administration
Authoritative general-purpose local government units serving this area
U.S. Census Bureau GUS (2026) / GMAF
| Government Unit | Unit Type | Jurisdiction Role | Contact / Address |
|---|---|---|---|
|
COUNTY OF CALDWELL
GUS Population: 52,430 (2024)
ID: 209531
|
County | Official County Government |
Contact: COUNTY JUDGE
110 S MAIN ST, RM 201, LOCKHART TX 78644-2701
|
Education
Listing 10 local institutions (NCES 2024-2025)
External reference via K12Guides
| Institution | Type | Grades | Location |
|---|---|---|---|
| Alternative School Nearby | 06-12 | BUDA, TX | |
| Regular School Nearby | 06-08 | KYLE, TX | |
| Regular School Nearby | PK-05 | SAN MARCOS, TX | |
| Regular School Nearby | PK-02 | WIMBERLEY, TX | |
| Regular School Nearby | PK | SAN MARCOS, TX | |
| Regular School Nearby | KG-05 | SAN MARCOS, TX | |
| Regular School Nearby | PK-05 | BUDA, TX | |
| Regular School Nearby | PK-05 | NIEDERWALD, TX | |
| Regular School Nearby | 09-12 | NEW BRAUNFELS, TX | |
| Regular School Nearby | 09-12 | FISCHER, TX |
Source: k12guides.com.
Community Facilities & Infrastructure
Displaying 10 civic institutions across 2 datasets queried
CMS • IPEDS • IMLS
| Facility Name | Category | Relationship | Address / Location | Contact |
|---|---|---|---|---|
|
Texas State University
|
College | 2.6 mi away | 601 University Dr, San Marcos, TX, 78666 |
5122452111
|
|
SAN MARCOS PUBLIC LIBRARY
|
Library | 3.2 mi away | 625 E HOPKINS ST, SAN MARCOS, TX, 78666 |
(512) 393-8200
|
|
Total Transformation Institute of Cosmetology
|
College Vocational | 3.9 mi away | 907 Highway 80, San Marcos, TX, 78666-8115 |
5123928862
|
|
MARTINDALE COMMUNITY LIBRARY
|
Library | 8.9 mi away | 411 MAIN ST, MARTINDALE, TX, 78655 |
(512) 357-4492
|
|
William Edge Institute
|
College Vocational | 14.5 mi away | 651 North Business IH 35, Suite 330, New Braunfels, TX, 78130-8216 |
8303874094
|
|
KYLE PUBLIC LIBRARY
|
Library | 9.5 mi away | 550 SCOTT ST, KYLE, TX, 78640 |
(512) 268-7411
|
|
Texas Lutheran University
|
College | 21.3 mi away | 1000 W. Court St, Seguin, TX, 78155-5999 |
8303728000
|
|
WIMBERLEY VILLAGE LIBRARY
|
Library | 11.0 mi away | 400 FM 2325, WIMBERLEY, TX, 78676 |
(512) 847-2188
|
|
Seguin Beauty School-Seguin
|
College Vocational | 21.6 mi away | 102 E Court St, Seguin, TX, 78155 |
8303720935
|
|
LAKEMOBILE
|
Library | 12.3 mi away | 16311 S ACCESS RD, CANYON LAKE, TX, 78133 |
(830) 964-3744
|
Distances calculated from authoritative source coordinates. Source: CMS, IMLS, NCES IPEDS.
Climate & Weather Observations
NOAA Monthly Climate Normals
Observation Station: Climate data reflects NOAA 1991–2020 standard normals recorded at SAN MARCOS, TX US, located 2.1 miles from ZCTA5 78666. Local microclimates, topography, and elevation may cause municipal conditions to differ.
| Month | High (°F) | Low (°F) | Mean (°F) | Precip (in) | Snow (in) |
|---|---|---|---|---|---|
| January | 62.3° | 38.9° | 50.6° | 2.41" | 0.0" |
| February | 66.6° | 42.4° | 54.5° | 1.73" | 0.0" |
| March | 73.1° | 49.5° | 61.3° | 2.76" | 0.0" |
| April | 79.8° | 56.3° | 68.0° | 3.20" | 0.0" |
| May | 86.2° | 64.9° | 75.5° | 4.53" | 0.0" |
| June | 92.4° | 71.7° | 82.1° | 3.57" | 0.0" |
| July | 95.7° | 73.4° | 84.5° | 2.21" | 0.0" |
| August | 96.8° | 73.7° | 85.2° | 2.60" | 0.0" |
| September | 90.5° | 68.5° | 79.5° | 4.03" | 0.0" |
| October | 82.1° | 58.1° | 70.1° | 4.41" | 0.0" |
| November | 71.5° | 48.3° | 59.9° | 2.69" | 0.0" |
| December | 63.7° | 40.8° | 52.2° | 2.41" | 0.0" |
Source: NOAA U.S. Climate Normals (1991–2020).
Local Weather Forecast
Weather forecast data is currently unavailable in the local cache.
Nearby Cities & Communities
Listing adjacent communities by spatial proximity (miles)
Proximity discovery
| Community Name | Classification | Distance | Population |
|---|---|---|---|
| San Marcos city | City | 3.0 mi | — |
| Redwood CDP | CDP | 6.7 mi | — |
| Martindale city | City | 9.1 mi | — |
| Wimberley city | City | 9.5 mi | — |
| Kyle city | City | 9.9 mi | — |
| Mountain City city | City | 12.2 mi | — |
Sources & Data Provenance
- Geographic Classification & Identifiers: U.S. Census Bureau Gazetteer (2026) and TIGER/Line Shapefiles. GEOID: 78666. • Official Source Dataset →
- Socioeconomic & Housing Metrics: U.S. Census Bureau American Community Survey (ACS) 5-year estimates and Population Estimates Program (PEP). Margin of Error (MOE) intervals are reported where published; suppressed values are never estimated or replaced with false zeros.
- Civic Directory Datasets: Centers for Medicare & Medicaid Services (CMS Hospital Directory), National Center for Education Statistics (NCES IPEDS Postsecondary Directory), and Institute of Museum and Library Services (IMLS Public Libraries Survey). Airport landing facilities are provided by airport-data.com.
- Weather & Climate Observations: National Oceanic and Atmospheric Administration (NOAA) U.S. Climate Normals 1991–2020 and National Weather Service (NWS) point forecasts.