San Marcos, Texas Population 2021

66,952
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San Marcos is a city located in Hays County Texas. It is also the county seat of Hays County. With a 2020 population of 66,952, it is the 60th largest city in Texas and the 565th largest city in the United States . San Marcos is currently growing at a rate of 1.65% annually and its population has increased by 49.13% since the most recent census, which recorded a population of 44,894 in 2010. San Marcos reached it's highest population of 66,952 in 2021. Spanning over 34 miles, San Marcos has a population density of 1,961 people per square mile.

The average household income in San Marcos is $54,535 with a poverty rate of 32.15%. The median rental costs in recent years comes to $1,064 per month, and the median house value is $171,500. The median age in San Marcos is 24.2 years, 25.3 years for males, and 22.9 years for females.

San Marcos Demographics

According to the most recent ACS, the racial composition of San Marcos was:

  • White: 84.29%
  • Black or African American: 6.38%
  • Other race: 3.85%
  • Two or more races: 2.65%
  • Asian: 2.47%
  • Native American: 0.27%
  • Native Hawaiian or Pacific Islander: 0.08%
The current population of San Marcos, Texas is 66,952 based on our projections of the latest US Census estimates. The US Census estimates the 2018 population at 63,688.The last official US Census in 2010 recorded the population at 44,894.

San Marcos, Texas Population 2021

Population by Race

Race Population Percentage
White53,29084.29%
Black or African American4,0346.38%
Some Other Race2,4353.85%
Two or More Races1,6752.65%
Asian1,5642.47%
American Indian and Alaska Native1700.27%
Native Hawaiian and Other Pacific Islander520.08%
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San Marcos Population by Race

San Marcos Population Pyramid $2021

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San Marcos Median Age

24.2


Total

25.3


Male

22.9


Female

San Marcos Adults

There are 54,440 adults, (4,711 of whom are seniors) in San Marcos.

San Marcos Age Dependency

27.1

Age Dependency Ratio

9.5

Old Age Dependency Ratio

17.7

Child Dependency Ratio

San Marcos Sex Ratio

Female

32,594

51.56%

Male

30,626

48.44%

San Marcos Population by Age

San Marcos Renter vs Owner Occupied by Household Type

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San Marcos Household Types

Type Owner Renter
Married64%36%
All29.7%70.3%
Male27.8%72.2%
Female24%76%
Non Family14.7%85.3%

29.7%

Rate of Home Ownership

San Marcos Households and Families

Type Count Average Size Owned
All23,1542.4529.7
Non Family13,0941.8814.7
Married6,2123.1264
Female2,4993.3424
Male1,3493.3627.8

3.05

Average Family Size

2.45

Average Household Size

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San Marcos Households by Type

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Education Attained Count Percentage
Less Than 9th Grade1,5005.00%
9th to 12th Grade2,3047.67%
High School Graduate7,52225.05%
Some College6,99323.29%
Associates Degree1,6575.52%
Bachelors Degree6,61122.02%
Graduate Degree3,43611.44%
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San Marcos Educational Attainment by Sex (over 25)

San Marcos Educational Attainment by Race

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Race Total High School Bachelors
White14,51613,8967,220
Hispanic12,6919,7191,911
Black1,4951,403278
Other Race1,1911,020156
Asian812754474
2+ Races636585184
Native American14314347
Islander1616

The highest rate of high school graduation is among native american people with a rate of 100.00%.

The highest rate of bachelors degrees is among asian people with a rate of 58.37%.

San Marcos Educational Attainment by Race

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Name Average Male Female
Overall$32,247$37,710$28,213
Less Than 9th Grade$25,826$27,418$23,087
High School Graduate$27,806$31,940$22,391
Some College$30,062$37,328$25,476
Bachelors Degree$40,131$46,901$38,269
Graduate Degree$49,264$55,156$40,492

$32,247

Average Earnings

$37,710

Average Male

$28,213

Average Female

San Marcos Earnings by Educational Attainment

San Marcos Language by Age

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San Marcos Language

71.35% of San Marcos residents speak only English, while 28.65% speak other languages. The non-English language spoken by the largest group is Spanish, which is spoken by 25.28% of the population.

San Marcos Language

San Marcos Poverty by Race

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Name Total In Poverty Poverty Rate
White26,6228,99833.80%
Hispanic24,7947,85331.67%
Black2,96099833.72%
Other2,22689440.16%
Asian1,33223917.94%
Multiple1,40519914.16%
Islander522038.46%

32.15%

Overall Poverty Rate

26.64%

Male Poverty Rate

37.54%

Female Poverty Rate

Poverty in San Marcos

The race most likely to be in poverty in San Marcos is Other, with 40.16% below the poverty level.

The race least likely to be in poverty in San Marcos is Multiple, with 14.16% below the poverty level.

The poverty rate among those that worked full-time for the past 12 months was 6.90%. Among those working part-time, it was 51.20%, and for those that did not work, the poverty rate was 46.54%.

San Marcos Poverty

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Name Poverty
Some College21.28%
Less Than 9th Grade20.91%
High School16.43%
Bachelors or Greater6.83%

San Marcos Poverty Rate by Education

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Rate Poverty
Female Unemployed60.66%
Male Unemployed55.91%
Female Employed29.49%
Male Employed17.28%

San Marcos Poverty Rate by Employment Status and Sex

San Marcos Income by Household Type

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Name Median Mean
Households$40,370$54,535
Families$54,411$72,812
Married Families$70,246-
Non Families$29,078$38,586
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Income by Household Type

San Marcos Marital Status

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Marriage Rates

24.8%

Overall Marriage Rate

26.2%

Male Marriage Rate

23.5%

Female Marriage Rate

San Marcos Married by Age and Sex

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San Marcos Marriage

The age group where males are most likely to be married is Over 65, while the female age group most likely to be married is 45-54.

San Marcos Marital Status by Race

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San Marcos Marital Status

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2,587

Number of Veterans

2,384

Male Veterans

203

Female Veterans

War Veterans
Second Gulf War1,035
First Gulf War701
Vietnam553
Korea132
World War II21

San Marcos Veterans by War

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Age Group Veterans
35 to 54960
18 to 34539
65 to 74415
75+392
55 to 64281

San Marcos Veterans by Age

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Name Veterans % of Total
White2,0364.40%
Hispanic8333.86%
Black3219.10%
2+ Races13111.80%
Other Race763.91%
Native American2313.53%

San Marcos Veterans by Race

San Marcos Veterans by Education

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14.47%

Veteran Poverty Rate

28.58%

Veteran Disability Rate

San Marcos Veterans by Education

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67.3%

Labor Force Participation

62.2%

Employment Rate

7.5%

Unemployment Rate

San Marcos Employment by Age

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San Marcos Employment by Race

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San Marcos Employment by Education

Origin of Non-Citizens

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Non citizens include legal permanent residents (green card holders), international students, temporary workers, humanitarian migrants, and illegal immigrants.

Origin of Naturalized Citizens

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68.20%

Born in San Marcos

90.92%

Native Born

9.08%

Foreign Born

5.35%

Non Citizen

3.73%

Naturalized

Place of Birth

90.92% of San Marcos residents were born in the United States, with 68.20% having been born in Texas. 5.35% of residents are not US citizens. Of those not born in the United States, the largest percentage are from Latin America.

San Marcos Place of Birth

Year Population Growth Annual Growth Rate
202166,9521,0881.65%
202065,8641,0881.68%
201964,7761,0881.71%
201863,6881620.26%
201763,5261,8002.92%
201661,7261,2802.12%
201560,4461,4632.48%
201458,9834,5808.42%
201354,4034,3938.78%
201250,0102,3234.87%
201147,6872,4205.35%
201045,26710,5342.68%
200034,7335,9901.91%
199028,7435,3232.07%
198023,4204,5602.19%
197018,8606,1474.02%
196012,7132,7332.45%
19509,9803,9745.21%
19406,0068721.58%
19305,1346071.27%
19204,5274561.07%
19104,0710.00%

San Marcos Population by Year