Is San Marcos, TX growing?

Name: Growth in San Marcos, TX, 2020–2024
Creator: US Census Bureau
License: https://www.census.gov/data/developers/about/terms-of-service.html

San Marcos, TX had an estimated 70,897 (±80) residents in 2020–2024, against 63,220 in 2015–2019.

That is a change of +12.1%, a measurable increase.

Its housing went from 25,472 to 30,349 homes (+19.1%), a measurable increase.

7.1% of today’s homes were built in 2020 or later.

Figures last updated on November 12, 2026.

Residents now: 70,897 (±80)
Amount of change: +12.1%
Homes change: +19.1%
Built 2020 or later: 7.1%

Residents and homes in San Marcos, 2015–2019 and 2020–2024

2015–2019 and 2020–2024 American Community Survey 5-year estimates
	2015–2019	2020–2024	Amount of change	Verdict
Residents	63,220 (±472)	70,897 (±80)	+12.1%	Measurable increase
Housing units	25,472 (±747)	30,349 (±818)	+19.1%	Measurable increase
Households that rent	70.3% (±2.5 points)	69.2% (±2.5 points)	−1.1 percentage points	Not a measurable change
Median gross rent	$1,064 (±$32)	$1,322 (±$39)	+24.2%	No measurable change after inflation
Median home value	$171,500 (±$8,263)	$310,400 (±$22,179)	+81.0%	Up after inflation

The Census Bureau publishes 2015–2019 dollars in 2019 dollars and 2020–2024 dollars in 2024 dollars.

Prices (the CPI-U, US Bureau of Labor Statistics) rose 22.7% between 2019 and 2024, so a dollar figure’s verdict compares the two after raising the earlier one by that much, using the Census Bureau’s test for a difference.

The two periods do not overlap, as the Census Bureau recommends for 5-year estimates.

Growth in San Marcos against Hays County, its state and the nation

Change between 2015–2019 and 2020–2024
	Residents	Verdict	Housing units
San Marcos	+12.1%	Measurable increase	+19.1%
Hays County	+25.9%	Measurable increase	+33.0%
Texas	+6.8%	Measurable increase	+10.9%
United States	+3.1%	Measurable increase	+4.6%

A change in a place’s boundaries between the two periods (an annexation, say) changes its counts as well; the Census Bureau’s figures are for the place as it was drawn in each period.

New homes in San Marcos

Housing units by year built, 2020–2024
Year built	San Marcos	Hays County	Texas	United States
2020 or later	7.1% (±1.5 points)	10.1%	4.0%	2.0%
2010 to 2019	25.8% (±2.5 points)	32.5%	17.4%	9.4%
2000 to 2009	18.9% (±2.6 points)	23.6%	17.9%	13.6%

32.9% of the homes in San Marcos were built in 2010 or later.

The median age of residents is 25.5 years.

Growth in places near San Marcos

Change in residents between 2015–2019 and 2020–2024
Place	Distance	Residents now	Amount of change	Verdict
San Marcos	—	70,897	+12.1%	Measurable increase
Redwood	4.7 mi	3,441	−14.7%	Not a measurable change
Martindale	6.2 mi	1,072	+17.4%	Not a measurable change
Kyle	8.9 mi	56,823	+33.1%	Measurable increase
Staples	10 mi	288	+25.2%	Not a measurable change
Uhland	11 mi	2,520	+108.1%	Measurable increase
Mountain City	12 mi	787	+6.5%	Not a measurable change
Wimberley	12 mi	2,891	−4.8%	Measurable decrease
Niederwald	13 mi	1,029	+78.6%	Not a measurable change

Survey years: 2020–2024 (American Community Survey 5-year estimates), compared with 2015–2019.

Margins of error are at the 90% confidence level.

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Questions about San Marcos

Is San Marcos growing?

San Marcos, TX had an estimated 70,897 residents in 2020–2024 and 63,220 in 2015–2019, a change of +12.1%: a measurable increase by the Census Bureau’s test.

How many homes have been added in San Marcos?

The estimated number of housing units went from 25,472 in 2015–2019 to 30,349 in 2020–2024 (+19.1%), a measurable increase.

How much new construction is there in San Marcos?

7.1% of homes in San Marcos were built in 2020 or later and 25.8% between 2010 and 2019.

Sources

To check these figures in the Census Bureau’s own API, request the variables below from the 2024 ACS 5-year data profile (acs/acs5/profile) for San Marcos city, Texas (place:65600, in state:48).

Each estimate (E or PE) has a margin of error beside it (M or PM).

The 2015–2019 figures are B01003_001E, B01003_001M, B25001_001E, B25001_001M, DP04_0047PE, DP04_0047PM, B25064_001E, B25064_001M, B25077_001E, B25077_001M from the 2019 release.

The API needs a free key.

Request a Census API key.

DP05_0001E, DP05_0001M, DP04_0001E, DP04_0001M, DP04_0017PE, DP04_0017PM, DP04_0018PE, DP04_0018PM, DP05_0018E, DP05_0018M

This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.

Figures are published by the US Census Bureau, HUD, the Bureau of Labor Statistics and the FBI; Seayora reproduces them and does not adjust them, except where a sentence says it compares dollar figures after inflation. They describe the whole place, not any one building or street, and are not an appraisal, a rent determination, a tax bill, a safety rating or legal advice.