San Marcos ZIP Code, Texas USA

San Marcos is one of the popular cities of Texas, covers 2 zip codes 3 counties, and accommodates a total population of 67,143 residents, based on the 2022 American Community Survey (ACS 5-year) data. The 78666 ZIP code's location SAN MARCOS ANNEX is the most populated location having 86,530 residents, among all ZIP code locations in San Marcos, TX. This resource summarizes its demographic information such as San Marcos city zip codes, population, area codes, household income, per capita income including other useful socio-economic indicators.

San Marcos, TX ZIP Codes Cover 2 Locations

The ZIP codes of San Marcos covers 2 major locations in Texas in the United States.

ZIP Code	Post Office Location	Post Office	Population
78666	SAN MARCOS ANNEX 210 S STAGECOACH TRL	Standard	86530
78667	SAN MARCOS 900 BUGG LN STE 110A	Post-Box Only using 78666 Facility	-

All 2 ZIP Codes of San Marcos, TX Part of 3 Counties

2 ZIP code locations of San Marcos, TX spread across 3 counties of Texas in the United States.

• Caldwell County
• Guadalupe County
• Hays County

2 Area Codes are used in San Marcos, TX

2 NPA codes 512 and 737 are being used in all San Marcos city, TX ZIP code locations in the United States, according to North American Numbering Plan Administrator (NANPA).

• 512 Area Code
• 737 Area Code

City of San Marcos, TX Socio-economic and Demographic Data

San Marcos is a city in Caldwell County, Guadalupe County and Hays County, Texas, USA. This socio-economic and demographic dynamics of San Marcos, TX briefly summarizes how its total population of 67,143 residents (31,946 males and 35,197 females) connected to education, employment, income, housing and more.

City	San Marcos
County	Caldwell County, Guadalupe County and Hays County
State	Texas
Total Population	67,143
Median Age	25
Total Male Population	31,946
Total Female Population	35,197
Male Female Ratio	908 female per 1,000 male
Younger Ppulation below 16 years	7,629
White Population	44,320
Hispanic or Latino Population	28,124
Black Population	4,135
Asian Population	1,549
Total US Natives or Citizens	67,143
Total Non US Citizens	4,017
Per Capita Income	$25,282
Total Household Income	$60,543
Total Housing Units	26,980
Vacant Housing Units	2,560

This population information for San Marcos city is sourced from 2022 American Community Survey (ACS 5-year) data.

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