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San Marcos, Texas Demographics and Housing Data
| State Abbreviation: | TX |
| City Type: | City |
| Total Population: | 44894 |
| Population Median: | 23.1 |
| Population Male: | 22305 |
| Population Female: | 22589 |
| Average Houshold Size: | 2.27 |
| Average Family Size: | 3.03 |
| Total Households: | 17031 |
| Total Housing Units: | 18179 |
General Population
| Population Under 5: | 1983 |
| 5 to 9: | 1719 |
| 10 to 14: | 1654 |
| 15 to 19: | 6210 |
| 20 to 24: | 14916 |
| 25 to 29: | 4601 |
| 30 to 34: | 2234 |
| 35 to 39: | 1754 |
| 40 to 44: | 1542 |
| 45 to 49: | 1443 |
| 50 to 54: | 1386 |
| 55 to 59: | 1342 |
| 60 to 64: | 1117 |
| 65 to 69: | 801 |
| 70 to 74: | 627 |
| 75 to 79: | 520 |
| 80 to 84: | 499 |
| 85 Plus: | 546 |
| Population Median: | 23.1 |
| Population 16 Plus: | 39208 |
| Population 18 Plus: | 38504 |
| Population 21 Plus: | 29698 |
| Population 62 Plus: | 3646 |
| Population 65 Plus: | 2993 |
Male Population
| Population Male: | 22305 |
| Under 5: | 1033 |
| 5 to 9: | 857 |
| 10 to 14: | 871 |
| 15 to 19: | 2678 |
| 20 to 24: | 7434 |
| 25 to 29: | 2692 |
| 30 to 34: | 1246 |
| 35 to 39: | 918 |
| 40 to 44: | 811 |
| 45 to 49: | 707 |
| 50 to 54: | 727 |
| 55 to 59: | 628 |
| 60 to 64: | 535 |
| 65 to 69: | 362 |
| 70 to 74: | 270 |
| 75 to 79: | 202 |
| 80 to 84: | 175 |
| 85 Plus: | 159 |
| Population Male Median: | 23.5 |
| Male 16 Plus: | 19377 |
| Male 18 Plus: | 19008 |
| Male 21 Plus: | 15288 |
| Male 62 Plus: | 1492 |
| Male 65 Plus: | 1168 |
Female Population
| Population Female: | 22589 |
| Under 5: | 950 |
| 5 to 9: | 862 |
| 10 to 14: | 783 |
| 15 to 19: | 3532 |
| 20 to 24: | 7482 |
| 25 to 29: | 1909 |
| 30 to 34: | 988 |
| 35 to 39: | 836 |
| 40 to 44: | 731 |
| 45 to 49: | 736 |
| 50 to 54: | 659 |
| 55 to 59: | 714 |
| 60 to 64: | 582 |
| 65 to 69: | 439 |
| 70 to 74: | 357 |
| 75 to 79: | 318 |
| 80 to 84: | 324 |
| 85 Plus: | 387 |
| Population Female Median: | 22.7 |
| Female 16 Plus: | 19831 |
| Female 18 Plus: | 19496 |
| Female 21 Plus: | 14410 |
| Female 62 Plus: | 2154 |
| Female 65 Plus: | 1825 |
Populations by Race
| Population of Two or More Races: | 1408 |
| White & Asian: | 200 |
| White & Indian: | 243 |
| White & Black: | 262 |
| White & Other: | 424 |
| Population Race White: | 36463 |
| Black: | 2881 |
| American Indian: | 688 |
| Asian: | 1034 |
| Hawaiian: | 107 |
| Hispanic: | 16967 |
| Other: | 5231 |
Household Statistics
| Average Household Size: | 2.27 |
| Average Family Size: | 3.03 |
| Population in Households: | 38692 |
| Householder: | 17031 |
| Spouse: | 3889 |
| Child: | 6989 |
| Child Under 18: | 5244 |
| Other Relatives: | 2283 |
| Other Relatives Under 18: | 836 |
| Other Relatives 65 Plus: | 178 |
| Non Relatives: | 8500 |
| Non Relatives Under 18: | 124 |
| Non Relatives 65 Plus: | 46 |
| Non Relatives Unmarried Partner: | 1421 |
Group Quarters Population
| Population Group Quarters: | 6202 |
| Institutionalized: | 729 |
| Institutionalized Male: | 419 |
| Institutionalized Female: | 310 |
| Non Institutionalized: | 5473 |
| Non Institutionalized Male: | 2352 |
| Non Institutionalized Female: | 3121 |
Family Household Statistics
| Total Households: | 17031 |
| Family Households: | 6485 |
| With Children Under 18: | {DL |
| Husband, Wife, Family: | 3889 |
| Husband, Wife, Family, Children Under 18: | 1602 |
| Male No Wife: | 866 |
| Male No Wife, Children Under 18: | 331 |
| Female No Husband: | 1730 |
| Female No Husband, Children Under 18: | 928 |
Non Family Household Statistics
| Non Family Households: | 10546 |
| Living Alone: | 5630 |
| Living Alone Male: | 2755 |
| Living Alone Male 65 Plus: | 231 |
| Living Alone Female: | 2875 |
| Living Alone Female 65 Plus: | 649 |
| Households with Individuals Under 18: | 3300 |
| 65 Plus: | 2108 |
Housing Unit Data
| Total Housing Units: | 18179 |
| Occupied Housing Units: | 17031 |
| Vacant Housing Units: | 1148 |
| Vacant Housing Units For Rent: | 772 |
| Vacant Housing Units Rented, Not Occupied: | 21 |
| Vacant Housing Units For Sale: | 89 |
| Vacant Housing Units Sold, Not Occupied: | 23 |
| Vacant Housing Units For Seasonal, Occasional Use: | 76 |
| Vacant Housing Units, All Other Vacants: | 167 |
| Housing Units, Homeowner Vacancy Rate Percent: | 1.9 |
| Housing Units, Rental Vacancy Rate Percent: | 5.8 |
| Housing Tenure, Occupied Housing Units: | 17031 |