2025 Compare Cities People:
Castle Rock, CO vs San Marcos, TX

Change Cities
Highlights
- San Marcos is 0% more densely populated than Castle Rock.
- People are 55.5% less likely to be married in San Marcos.
- The Median Age is 10.8 years younger in San Marcos.
 Castle Rock, COSan Marcos, TXUnited States
 Population  Unlock64,812329,725,481
 Female Population50.4%  Unlock50.5%
 Male Population49.6%  Unlock49.5%
 Median Age  Unlock24.938.4
 space3
 Population - 201048,793  Unlock309,327,143
 Population - 2000  Unlock34,733285,036,114
 Population - 19908,708  Unlock251,960,433
 Pop. 2000 to Now  Unlock91.0%15.6%
 Pop. 1990 to Now710.4%  Unlock30.8%
 space4
 Population Density  Unlock1,905.393.4
 Land Area34.3  Unlock3,531,905.4
 Water Area  Unlock0.1264,836.8
 space
 Est. Total Population By Age
 Castle Rock, COSan Marcos, TXUnited States
 Age 0 to 47.4%  Unlock5.9%
 Age 5 to 9  Unlock3.3%6.1%
 Age 10 to 147.2%  Unlock6.6%
 Age 15 to 17  Unlock2.4%3.9%
 Age 18 to 204.1%  Unlock4.0%
 Age 21 to 24  Unlock20.5%5.2%
 Age 25 to 3412.9%  Unlock13.8%
 Age 35 to 44  Unlock9.6%12.9%
 Age 45 to 5414.3%  Unlock12.6%
 Age 55 to 59  Unlock3.4%6.7%
 Age 60 to 644.7%  Unlock6.3%
 Age 65 to 74  Unlock6.1%9.6%
 Age 75 to 843.0%  Unlock4.5%
 Age 85 and over  Unlock1.3%1.9%
 space1
 Race
 Castle Rock, COSan Marcos, TXUnited States
 White81.6%  Unlock59.4%
 Black  Unlock6.6%12.2%
 Asian2.0%  Unlock5.6%
 Native American  Unlock0.2%0.6%
 Hawaiian, Pacific Islander0.2%  Unlock0.2%
 Other  Unlock1.4%0.4%
 Two or More Races3.8%  Unlock3.2%
 Hispanic  Unlock40.9%18.4%
 space2
 Marriage & Family
 Castle Rock, COSan Marcos, TXUnited States
 Married Population62.5%  Unlock49.8%
     Currently Married  Unlock26.2%48.0%
 Married but Separated0.7%  Unlock1.8%
 Single Population  Unlock72.2%50.2%
 Never Married24.5%  Unlock33.8%
 Divorced  Unlock8.1%10.8%
 Widowed3.0%  Unlock5.6%
 space5
 Household Size  Unlock2.292.60
 Households24,867  Unlock124,010,992
 Family Households  Unlock11,05280,755,759
     Married couple, w/children48.9%  Unlock30.5%
     Married couple, no children  Unlock40.8%42.9%
 Non Family Households5,755  Unlock43,255,233
     Single householder, w/children  Unlock16.7%15.8%
     Single householder, no children5.1%  Unlock10.8%
Reviews for Castle Rock    12 Reviews

My fiance and I moved here in 2018 shortly after finishing college. I work in Colorado Springs and she works in the Denver area, so Castle Rock was practically our only  More

   |    Reply

Over 7 years ago

I have always been mobile for my career, until I moved to Castle Rock. I've lived in in multiple cities in the Midwest including Chicago and have visited nearly every  More

   |    Reply

Over 11 years ago

we have four seasons, and the rockies are only two hrs.away. so for the outdoors enthusist sking or hiking is like no other place you have been or seen it is hard to  More

   |    Reply

Start Your Review of Castle Rock

Reviews for San Marcos    6 Reviews

An area with so much potential and existing natural beauty.Sadly bad urban planning is clearly obvious.Looks like fun for tens of thousands of students.However for the  More

   |    Reply

Over 16 years ago

San Marcos has the most beautiful people and places that I have ever seen throughout my travels. I love this city so much that I decided to settle down here and start a  More

   |    Reply

Over 17 years ago

I spent several summers and a couple winters in San Marcos during my formidable years and really have to tell those interested about what a nice town it is. The best  More

   |    Reply

Start Your Review of San Marcos


Premium Subscription
Includes Cost of Living compares for child care, utilities, transportation, health, taxes, housing for home owners vs renters, weather, insurance premiums and so much more.


The premier source for comprehensive city data for over 30 years.

© Best Places. All rights reserved.