Data Last Updated: March 1, 2023

ZIP Codes for City of San Marcos, TX


    
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Counties:	HAYS, TX
Area Code(s):	512, 737
Timezone(s):	Central (GMT -06:00)
City Population:	44,894 (More Details)
CBSA:	Austin-Round Rock-Georgetown, TX
Congressional District(s):	15, 21, 35
Land Area:	678 square miles (county)
Water Area:	2 square miles (county)

2 ZIP Codes

San Marcos, TX ZIP Code Boundaries

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San Marcos, TX Covers 2 ZIP Codes

ZIP Code	Type	Population	% of Population	Aliases
78666	Standard	63,836	100.00%
78667	P.O. Box	0	0.00%

San Marcos, TX Demographic Information *

Total population**	44,894
Male population	22,305
Female population	22,589
Median age (years)	23.1
White Population	35,221
Black Population	2,465
Indian Population	383
Asian Population	697
Hawaiian Population	55
Hispanic Population	16,967
Median age (Male)	23.5
Median age (Female)	22.7
Total households	17,031
Family households (families)	6,485
Average household size	2.27
Average family size	3.03
Total housing units	18,179

* Demographic data is based on 2010 Census for the City of SAN MARCOS.
** City and ZIP Code Population will not be equal due to differences in their geographies.

References

U.S. Postal Service [Last Updated: 2/1/2023], https://www.usps.com
ZIP-Codes.com Internal Data Creation [Last Updated: 2/1/2023], https://www.zip-codes.com
U.S. Geological Survey [Updated as needed], https://www.usgs.gov/
U.S. Census [Updated Yearly], https://www.census.gov
U.S. Census 2010 [Decennial] [Last Updated: 1/1/2010], https://www.census.gov