ZIP Code 78666
| ZIP Code | 78666 |
| City | SAN MARCOS |
| State | TX |
| Type | STANDARD |
| Post offices count | 1 (see all) |
| Total population | 83,858 (see all) |
Cities in ZIP Code 78666
Primary city: SAN MARCOS, TXPost offices
SAN MARCOS — Post Office™ 900 BUGG LN STE 110A SAN MARCOS, TX 78666-9807 MoreSAN MARCOS — Post Office™900 BUGG LN STE 110A For facility accessibility, please call the Post Office. 1-800-ASK-USPS® (800-275-8777) Hours
Services at this Location Service hours may vary.
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Census data for ZIP Code 78666
Demographic and housing estimates in ZIP Code 78666
| Total population | 83,858 |
| Male | 40,597 |
| Female | 43,261 |
| Total population | 83,858 |
| Under 5 years | 3,047 |
| 5 to 9 years | 3,012 |
| 10 to 14 years | 4,041 |
| 15 to 19 years | 9,675 |
| 20 to 24 years | 19,294 |
| 25 to 34 years | 13,500 |
| 35 to 44 years | 8,943 |
| 45 to 54 years | 6,729 |
| 55 to 59 years | 3,149 |
| 60 to 64 years | 3,415 |
| 65 to 74 years | 5,469 |
| 75 to 84 years | 2,442 |
| 85 years and over | 1,142 |
| Median age (years) | 26.3 |
| Under 18 years | 12,570 |
| 16 years and over | 72,849 |
| 18 years and over | 71,288 |
| 21 years and over | 59,081 |
| 62 years and over | 10,884 |
| 65 years and over | 9,053 |
| Total population | 83,858 |
| One race | 73,772 |
| White | 61,904 |
| Black or African American | 5,233 |
| American Indian and Alaska Native | 304 |
| Asian | 1,720 |
| Native Hawaiian and Other Pacific Islander | 55 |
| Some other race | 4,556 |
| Two or more races | 10,086 |
| Citizen, VOTING AGE 18 and over population | 66,854 |
| Male Citizen, VOTING AGE 18 and over population | 31,856 |
| Female Citizen, VOTING AGE 18 and over population | 34,998 |
Social characteristics in ZIP Code 78666
| Total households | 31,811 |
| Family households (families) | 10,275 |
| Married-couple family | 2,986 |
| Male householder, no wife present, family | 8,075 |
| Female householder, no husband present, family | 4,289 |
| Nonfamily households | 10,475 |
| Average household size | 5,892 |
| Average family size | 2.39 |
Economic characteristics in ZIP Code 78666
| Total households | 31,811 |
| Less than $10,000 | 2,979 |
| $10,000 to $14,999 | 1,741 |
| $15,000 to $24,999 | 3,697 |
| $25,000 to $34,999 | 4,091 |
| $35,000 to $49,999 | 4,660 |
| $50,000 to $74,999 | 6,485 |
| $75,000 to $99,999 | 3,244 |
| $100,000 to $149,999 | 2,556 |
| $150,000 to $199,999 | 1,185 |
| $200,000 or more | 1,173 |
| Median household income (dollars) | 44,914 |
Housing characteristics in ZIP Code 78666
| Total housing units | 34,573 |
| Occupied housing units | 31,811 |
| Vacant housing units | 2,762 |
| Total housing units | 34,573 |
| 1-unit, detached | 13,506 |
| 1-unit, attached | 784 |
| 2 units | 1,305 |
| 3 or 4 units | 2,462 |
| 5 to 9 units | 1,755 |
| 10 to 19 units | 5,091 |
| 20 or more units | 6,675 |
| Mobile home | 2,973 |
| Boat, RV, van, etc. | 22 |
| Total housing units | 34,573 |
| Built 2014 or later | 78 |
| Built 2010 to 2013 | 7,543 |
| Built 2000 to 2009 | 6,850 |
| Built 1990 to 1999 | 6,174 |
| Built 1980 to 1989 | 5,631 |
| Built 1970 to 1979 | 3,798 |
| Built 1960 to 1969 | 1,553 |
| Built 1950 to 1959 | 1,378 |
| Built 1940 to 1949 | 858 |
| Built 1939 or earlier | 710 |
| Total housing units | 34,573 |
| 1 room | 960 |
| 2 rooms | 2,304 |
| 3 rooms | 5,252 |
| 4 rooms | 7,327 |
| 5 rooms | 8,062 |
| 6 rooms | 5,249 |
| 7 rooms | 2,522 |
| 8 rooms | 1,491 |
| 9 rooms or more | 1,406 |
| Median rooms | 4.7 |
| Total housing units | 34,573 |
| No bedroom | 994 |
| 1 bedroom | 5,317 |
| 2 bedrooms | 10,199 |
| 3 bedrooms | 12,490 |
| 4 bedrooms | 4,989 |
| 5 or more bedrooms | 584 |
| Occupied housing units | 31,811 |
| Owner-occupied | 11,253 |
| Renter-occupied | 20,558 |
| Average household size of owner-occupied unit | 2.61 |
| Average household size of renter-occupied unit | 2.28 |
| Occupied housing units | 31,811 |
| Moved in 2017 or later | 6,409 |
| Moved in 2015 to 2016 | 14,476 |
| Moved in 2010 to 2014 | 3,729 |
| Moved in 2000 to 2009 | 3,887 |
| Moved in 1990 to 1999 | 1,668 |
| Moved in 1989 and earlier | 1,642 |
| Owner-occupied units | 11,253 |
| Less than $50,000 | 1,053 |
| $50,000 to $99,999 | 1,192 |
| $100,000 to $149,999 | 1,710 |
| $150,000 to $199,999 | 1,599 |
| $200,000 to $299,999 | 3,150 |
| $300,000 to $499,999 | 2,007 |
| $500,000 to $999,999 | 452 |
| $1,000,000 or more | 90 |
| Median (dollars) | 202,500 |
| Owner-occupied units | 11,253 |
| Housing units with a mortgage | 6,752 |
| Housing units without a mortgage | 4,501 |
| Occupied units paying rent | 19,841 |
| Less than $500 | 432 |
| $500 to $999 | 5,830 |
| $1,000 to $1,499 | 9,561 |
| $1,500 to $1,999 | 2,829 |
| $2,000 to $2,499 | 1,109 |
| $2,500 to $2,999 | 0 |
| $3,000 or more | 80 |
| Median (dollars) | 1,159 |
| No rent paid | 717 |
Data is based on 2021 Census