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Summary for San Marcos

About San Marcos (Click for our profile page)

Located in: Primarily Hays County (see below). A portion of San Marcos extends into Caldwell County and Guadalupe County.

Time Zone: San Marcos lies in the Central Time Zone (CST/CDT)

Telephone Area Codes: 512 & 737<1>

ZIP Codes: 78666-78667<2>

Elevation: 560 feet [170.69 m] above sea level<3>

From the 2010 US Census (For more detail, see our Census Page for San Marcos)

Population

Year	Population
2019 Est:<4>	64,752 (44.23% increase since 2010)
2010:	44,894 (29.25% increase since 2000)
2000:	34,733

Total Area:<5> 30.35 sq. miles [78.6 km²]

Housing Units:<6> 18,179

Websites for San Marcos

Official Website: www.sanmarcostx.gov/

Chamber of Commerce: www.sanmarcostexas.com/

GPS Coordinates (Latitude/Longitude)<7>

For the purpose of mapping and calculating distances, we have chosen the following reference point for San Marcos:

Lat: 29.884200° (or 29°53'3" N)

Lon: -97.941600° (or -97°56'29" W)

USGS Topo Map: San Marcos North<8>

Federal GNIS/FIPS Codes for San Marcos

GNIS ID: 2411798

FIPS State / Place Code: 48 / 65600

(For more about Federal Codes, see our Misc Page for San Marcos)

About Hays County

The city of San Marcos is the County Seat for Hays County.

From the 2010 US Census (For more detail, see our Census Page for Hays)

Population

Year	Population
2019 Est:	230,191 (45.49% increase since 2010)
2010	158,214 (62.1% increase since 2000)
2000:	97,589

Total Area: 679 sq. miles [1,761 km²]

Housing Units: 59,417

Official Website: https://www.hayscountytx.gov/

Federal GNIS/FIPS Codes for Hays

GNIS ID: 1383890

FIPS State / County Code: 48 / 209

(For more about Federal Codes, see our Misc Page for San Marcos)

About Texas

From the US Census

Population

Year	Population
2019 Est:	28,986,794 (15.28% increase since 2010)
2010:	25,145,561 (20.59% increase since 2000)
2000:	20,851,820

Websites for State of Texas

Official Website: https://www.texas.gov/

Tourism: https://www.traveltexas.com/

Parks: https://tpwd.texas.gov/

Fishing: https://tpwd.texas.gov/regulations/outdoor-annual/fishing/

Hunting: https://tpwd.texas.gov/regulations/outdoor-annual/hunting/

Federal GNIS/FIPS Codes for State of Texas

GNIS ID: 1779801

FIPS State: 48

(For more about Federal Codes, see our Misc Page for San Marcos)

Footnotes ...

<1>	When there's a risk of an area code running out of phone numbers, an 'Overlay Area Code' is created that has the same geographic boundaries as the existing area code. In this case, the 512 code has been Overlayed with the 737 area code. New phone numbers in the San Marcos area will be assigned with one of these codes: 512 or 737. As a result, placing a call in the San Marcos area will require 10-digit dialing (where you enter both the area code and then the phone number).
<2>	ZIP Codes have been created by the United States Postal Service (USPS) as a way of grouping addresses to make delivery more efficient. The boundaries of the ZIP Code can be changed, re-assigned, eliminated or overlapped with other ZIP Codes. So keep in mind that any given ZIP Code is only 'loosely' associated with a city (such as San Marcos). When looking for a ZIP Code, whether San Marcos or elsewhere, it's always best to check the website of the United States Postal Service (USPS). Our list of ZIP Codes for San Marcos includes: 78666 & 78667.
<3>	The elevation is an estimate for the area around San Marcos - it will be higher in some places and lower in others.
<4>	Every year, the US Census Bureau creates a population estimate for the preceeding year. Keep in mind that this value is an estimate and not an actual count. The most recent Census estimate is for the year 2019.
<5>	The area value has been supplied by the US Census Bureau and it can be different than the geographic boundaries of San Marcos. The value given by the Census Bureau reflects their statistical (or sampling) requirements. For example, if there is a cluster of people living just outside of the community's official boundary, the Census-defined area might be expanded to include that group.
<6>	A Housing Unit is a broad term for those places where people live (whether occupied or temporarily vacant), such as a house, an apartment, a mobile home, or an area that is considered as a separate living quarter. Separate living quarters (consisting of one or more rooms) are considered to be those places where people live, sleep and eat separately from others and that have access to the outside (either directly or by a shared hallway).
<7>	Longitude & latitude values may not be the geographic center of San Marcos, rather it may be a prominent intersection or the center of population, etc. It will vary depending on the source.
<8>	Name of the USGS 7.5 Minute topographic map which includes San Marcos.