San Marcos ZIP Code List — Hays County, TX

There are 2 unique ZIP codes in San Marcos, Texas. Area code: 512/737.

ZIP codes

192.39

sq mi land

1.02

sq mi water

512/737

area code

San Marcos, TX ZIP code map

About San Marcos, TX

San Marcos, Texas, is a vibrant city located in Hays County. Known for its rich history and friendly community, San Marcos offers a blend of modern amenities and natural beauty. It attracts both residents and tourists with its lively atmosphere and abundant recreational opportunities.

Location & geography

San Marcos is situated approximately 30 miles southwest of Austin and about 50 miles northeast of San Antonio, making it conveniently located between these two major cities. The city spans a land area of 192.39 square miles and includes a water area of 1.02 square miles, contributing to its diverse landscape. The terrain is characterized by rolling hills and waterways, with the scenic San Marcos River flowing through the heart of the city.

Community & economy

San Marcos is characterized by its strong sense of community and a rich cultural heritage. The economy is supported by various industries including education, retail, and tourism, with Texas State University playing a pivotal role in the local landscape. Daily life in San Marcos is enriched by a variety of local shops, restaurants, and events that foster community engagement.

Transportation

Major highways serving San Marcos include Interstate 35, which provides easy access to neighboring cities. The nearest airport is the Austin-Bergstrom International Airport, located about 30 miles north of San Marcos. Public transit options are available, facilitating travel within the city and to surrounding areas.

History

San Marcos was founded in the mid-19th century and quickly developed due to its strategic location along the San Marcos River. Historically, the city has been a center for agriculture and trade, contributing significantly to the economy of Hays County. Notable events include the establishment of the San Marcos Springs, which became a popular destination for visitors and contributed to the city's growth.

Did you know?

One surprising fact about San Marcos is that it is home to the largest supported swimming pool in the United States, which is filled by the crystal-clear waters of the San Marcos River. Additionally, the city hosts the annual San Marcos Mermaid Capital of Texas Festival, celebrating its unique aquatic heritage.

ZIP codes for San Marcos, TX (2)

ZIP code	City	County	Map
78666	San Marcos	Hays	View map
78667	San Marcos	Hays	View map

Demographics & statistics

86,530

Population

26.5

Median age

$52,432

Median household income

$27,457

Per capita income

$248,700

Median home value

$1,245

Median monthly rent

37.4%

Home ownership

24.4%

Poverty rate

6.4%

Unemployment

15,150

Housing units

33.3%

Bachelor's or higher

Age distribution

Male Female

1,660

Under 5

1,751

1,476

5–9

1,557

1,788

10–14

1,886

4,487

15–19

4,734

9,906

20–24

10,450

6,763

25–34

7,133

4,568

35–44

4,819

3,398

45–54

3,584

1,572

55–59

1,659

1,900

60–64

2,005

2,904

65–74

3,064

1,146

75–84

1,209

541

85+

570

← Male

Female →

Age summary

Group	Count	%
Under 18	12,360	14.3%
18 and over	74,170	85.7%
65 and over	9,434	10.9%
Median age	26.5 years

Race & ethnicity

White 55.8%

Hispanic or Latino 17.6%

Two or more races 14.4%

Other race 5.7%

Black or African American 4.6%

Asian 1.5%

American Indian / Alaska Native 0.3%

Native Hawaiian / Pacific Islander 0.1%

Group	Count	%
White	58,603	55.8%
Hispanic or Latino	18,518	17.6%
Two or more races	15,154	14.4%
Other race	5,976	5.7%
Black or African American	4,807	4.6%
Asian	1,594	1.5%
American Indian / Alaska Native	331	0.3%
Native Hawaiian / Pacific Islander	65	0.1%

Household income

Under $10k 9.5%

$10k–$15k 5.2%

$15k–$25k 8.6%

$25k–$35k 11.9%

$35k–$50k 12.7%

$50k–$75k 21.5%

$75k–$100k 11.0%

$100k–$150k 10.4%

$150k–$200k 3.6%

$200k+ 5.7%

Range	% of households
Under $10k	9.5%
$10k–$15k	5.2%
$15k–$25k	8.6%
$25k–$35k	11.9%
$35k–$50k	12.7%
$50k–$75k	21.5%
$75k–$100k	11.0%
$100k–$150k	10.4%
$150k–$200k	3.6%
$200k+	5.7%
Median income	$52,432

Housing

Home values

Under $50k 8.7%

$50k–$100k 6.5%

$100k–$150k 9.4%

$150k–$200k 14.1%

$200k–$300k 26.2%

$300k–$500k 27.5%

$500k–$1M 6.7%

$1M+ 0.9%

Housing overview

Metric	Value
Median home value	$248,700
Median rent / month	$1,245
Owner occupied	37.4%
Renter occupied	62.6%
Vacant	7.7%
Single-family detached	38.9%
Large apartment buildings	20.4%
Mobile homes	8.8%
Median rooms	4.7
Avg household size (owned)	2.61

Year built

Era	%
2020 or later	1.9%
2010–2019	22.9%
2000–2009	19.1%
1990–1999	16.1%
1980–1989	16.1%
1970–1979	10.9%
1960–1969	4.6%
1950–1959	3.7%
1940–1949	2.4%
1939 or earlier	2.3%

Bedrooms

Size	% of units
No bedroom (studio)	3.1%
1 bedroom	14.9%
2 bedrooms	28.7%
3 bedrooms	37.8%
4 bedrooms	14.2%
5+ bedrooms	1.3%

Vehicles per household

Vehicles	% of households
No vehicle	4.9%
1 vehicle	33.8%
2 vehicles	39.2%
3 or more	22.1%

Heating fuel

Fuel type	%
Utility gas	20.6%
Electricity	76.3%
Propane / LP gas	2.5%
Wood	0.2%
Solar	0.1%
No fuel used	0.1%

Households & families

Household type	Count	%
Married-couple family	11,186	33.7%
Cohabiting couple	3,275	9.9%
Male householder, no spouse	7,736	23.3%
Female householder, no spouse	10,976	33.1%
Households with children under 18	6,701	20.2%
Households with seniors (65+)	6,190	18.7%
Average household size	2.36

Marital status

Status	Male	Female
Never married	56.1%	52.7%
Married	33.5%	31.7%
Separated	1.1%	1.8%
Widowed	1.5%	5.3%
Divorced	7.8%	8.4%

Education

Less than 9th grade 5.2%

Some HS, no diploma 6.4%

HS graduate 25.0%

Some college, no degree 23.5%

Associate's degree 6.5%

Bachelor's degree 20.3%

Graduate / professional 13.0%

Metric	%
HS diploma or higher	88.3%
Bachelor's or higher	33.3%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	468	1.4%
Kindergarten	721	2.1%
Elementary school	4,951	14.8%
High school	3,850	11.5%
College / grad school	23,566	70.2%

Employment

Industry of employment

Education & healthcare 24.5%

Arts, food & hospitality 15.8%

Retail trade 14.7%

Professional & management 9.8%

Construction 7.1%

Transportation & utilities 6.2%

Manufacturing 5.0%

Other services 4.7%

Finance & real estate 4.1%

Public administration 3.8%

Wholesale trade 2.0%

Information 1.3%

Agriculture & mining 1.0%

Occupation

Category	%
Management, business & arts	34.4%
Service	22.4%
Sales & office	23.7%
Natural resources & construction	7.8%
Production & transportation	11.6%

Employment type

Type	%
Private sector	76.1%
Government	18.4%
Self-employed	5.4%
Unpaid family workers	0.1%

Commute

Method	%
Drive alone	73.5%
Carpool	10.5%
Public transit	0.8%
Walk	4.2%
Other means	2.8%
Avg commute (minutes)	24.6

Poverty

All people 24.4%

Under 18 years 24.4%

18 and over 24.5%

Married-couple families 4.3%

Female-led households 30.3%

Income support

Source	% of households
Social Security	18.1%
Retirement income	15.3%
Supplemental Security	3.1%
Cash public assistance	3.0%
Food stamps / SNAP	8.1%

Health indicators

Condition	%
High blood pressure	23.4%
High cholesterol	25.4%
Heart disease	4.3%
Stroke	2.1%
Asthma	10.0%
Arthritis	14.4%
Kidney disease	2.3%
Pulmonary disease	5.0%
Cancer	3.5%

Behavior / access	%
Binge drinking	20.4%
No physical activity	24.5%
Less than 7 hrs sleep	30.8%
Fair or poor health	16.2%
Poor mental health	18.7%
Poor physical health	9.9%
No health insurance	30.3%
Visited doctor (checkup)	66.9%
Visited dentist	53.4%
Cholesterol screening	78.9%
Teeth loss	16.2%

Veterans & disability

Veterans	Count	%
Civilian veterans	3,401	4.6%

Disability	%
Any disability	13.8%
Under 18	7.7%
18–64 years	11.2%
65 and over	40.2%

Health insurance coverage

Type	%
Private insurance	69.3%
Public insurance	22.8%
Uninsured under 19	9.5%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	83,119	96.1%
Spanish	4,425	5.3%
Other Indo-European	3,577	4.3%
Asian & Pacific Islander	530	0.6%
Other languages	252	0.3%

Place of birth & citizenship

Origin	Count	%
Native born (US)	79,422	91.8%
Born in same state	78,453	90.7%
Born in different state	60,836	70.3%
Foreign born	969	1.1%
Naturalized citizen	7,108	8.2%
Not a US citizen	2,199	30.9%

Ancestry

Ancestry	Count	%
Italian	6,914	8%
French	6,410	7.4%
Arab	1,726	2%
Polish	699	0.8%
English	441	0.5%

Ancestry	Count	%
German	249	0.3%
Norwegian	58	0.1%
Irish	49	0.1%
Dutch	24	0%

Technology access

Metric	% of households
Computer access	38.3%
Internet access	95.8%

Source: U.S. Census Bureau, American Community Survey 2025 estimates.

Frequently asked questions

What is the ZIP code for San Marcos, TX?

San Marcos, TX has one ZIP code: 78666.

What is the main ZIP code for San Marcos, TX?

The primary ZIP code for San Marcos, TX is 78666. The city uses area code 512 or 737 for phone service.

What county is San Marcos, TX in?

San Marcos is located in Hays County, Texas.

How many ZIP codes are in San Marcos, TX?

San Marcos, TX has 1 ZIP code.

What ZIP code covers Texas State University's main campus in San Marcos?

Texas State University's main campus in San Marcos is located in ZIP code 78666, which encompasses the university's central academic and residential areas in the heart of the city.

What is the ZIP code for San Marcos's downtown historic district along Hopkins Street?

San Marcos's downtown historic district, including the shops and restaurants along Hopkins Street near the San Marcos River, is served by ZIP code 78666.