San Marcos, TX Profile: Facts, Map & Data


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San Marcos, Texas - Basic Facts

The City of San Marcos had a population of 55,290 as of July 1, 2017. San Marcos ranks in the upper quartile for Population Density and Diversity Index when compared to the other cities, towns and Census Designated Places (CDPs) in Texas. See peer rankings below.

The primary coordinate point for San Marcos is located at latitude 29.877 and longitude -97.9316 in Hays County. The formal boundaries for the City of San Marcos (see map below) encompass a land area of 30.23 sq. miles and a water area of 0.13 sq. miles. Hays County is in the Central time zone (GMT -6). The elevation is 617 feet.

While the primary coordinates for City of San Marcos are located in Hays County, it should be noted that the formal boundaries for this community also extend into Caldwell County, and Guadalupe County.

The City of San Marcos (GNIS ID: 2411798) has a C1 Census Class Code which indicates an active incorporated place that does not serve as a county subdivision equivalent. It also has a Functional Status Code of "A" which identifies an active government providing primary general-purpose functions.

Texas is one of 20 states where Census County Divisions (CCDs) are used for statistical tracking of subdivisions within each county. The City of San Marcos is located within San Marcos Division of Hays County.

Beneath the boundary map are tables with San Marcos population, income and housing data, five-year growth projections and peer comparisons for key demographic data. The estimates are for July 1, 2017.

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City of San Marcos, TX Boundary Map

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San Marcos, TX Data & Demographics (As of July 1, 2017)


Total Population 55,290
Daytime Population: Workers 36,102
Daytime Population: Residents 30,394
Total Daytime Population (TDP) 66,496
Ratio TDP/Total Population1 1.20
Population in Households 48,130
Population in Familes 25,175
Population in Group Qrtrs 7,160
Population Density2 1,829
Diversity Index3 72


Median Household Income $34,039
Average Household Income $50,076
Per Capita Income $21,830


Total Housing Units 22,755 (100%)
Owner Occupied HU 5,609 (24.6%)
Renter Occupied HU 15,649 (68.8%)
Vacant Housing Units 1,497 ( 6.6%)
Median Home Value $158,995
Average Home Value $199,790


Total Households 21,258
Average Household Size 2.26
Family Households 8,321
Average Family Size 3
  1. If the ratio of the TDP to Total Population is greater than 1, the location gains population during the day when commuting workers are present. If the ratio is less than 1, the location is more of a bedroom community where people commute to another place for work.
  2. Population Density = Total Population per square mile.
  3. The Diversity Index is a scale of 0 to 100 that represents the likelihood that two persons, chosen at random from the same area, belong to different race or ethnic groups. If an area's entire population belongs to one race AND one ethnic group, then the area has zero diversity. An area's diversity index increases to 100 when the population is evenly divided into two or more race/ethnic groups.


2010-2017 2017-2022
Population 2.91% 3.17%
Households 3.11% 3.63%
Families 3.5% 3.28%
Median Household Income   1.44%
Per Capita Income   2.23%

San Marcos, TX - Peer Comparisons by Rank and Percentile

The table below compares San Marcos to the other 1,749 incorporated cities, towns and CDPs in Texas by rank and percentile using July 1, 2017 data. The location Ranked # 1 has the highest value. A location that ranks higher than 75% of its peers would be in the 75th percentile of the peer group.

Variable Description Rank Percentile
Total Population # 65 96th
Population Density # 344 80th
Diversity Index # 208 88th
Median Household Income # 1446 17th
Per Capita Income # 1046 40th

Additional comparisons and rankings can be made with a VERY EASY TO USE Texas Census Data Comparison Tool.

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