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2025 Compare Cities People:
San Marcos, CA vs Castaic, CA

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Highlights
- Castaic is 0% more densely populated than San Marcos.
- People are 10.2% more likely to be married in Castaic.
- The Median Age is 2.6 years older in Castaic.
 San Marcos, CACastaic, CAUnited States
 Population  Unlock18,017329,725,481
 Female Population50.1%  Unlock50.5%
 Male Population49.9%  Unlock49.5%
 Median Age  Unlock38.238.4
 space3
 Population - 201083,948  Unlock309,327,143
 Population - 2000  Unlock18,001285,036,114
 Population - 199038,974  Unlock251,960,433
 Pop. 2000 to Now  Unlock5.8%15.6%
 Pop. 1990 to Now150.1%  Unlock30.8%
 space4
 Population Density  Unlock2,481.093.4
 Land Area24.4  Unlock3,531,905.4
 Water Area  Unlock0.0264,836.8
 space
 Est. Total Population By Age
 San Marcos, CACastaic, CAUnited States
 Age 0 to 46.9%  Unlock5.9%
 Age 5 to 9  Unlock6.5%6.1%
 Age 10 to 148.0%  Unlock6.6%
 Age 15 to 17  Unlock4.5%3.9%
 Age 18 to 205.2%  Unlock4.0%
 Age 21 to 24  Unlock4.2%5.2%
 Age 25 to 3412.9%  Unlock13.8%
 Age 35 to 44  Unlock12.5%12.9%
 Age 45 to 5412.4%  Unlock12.6%
 Age 55 to 59  Unlock9.2%6.7%
 Age 60 to 644.6%  Unlock6.3%
 Age 65 to 74  Unlock7.5%9.6%
 Age 75 to 843.3%  Unlock4.5%
 Age 85 and over  Unlock0.9%1.9%
 space1
 Race
 San Marcos, CACastaic, CAUnited States
 White43.5%  Unlock59.4%
 Black  Unlock1.7%12.2%
 Asian10.5%  Unlock5.6%
 Native American  Unlock0.1%0.6%
 Hawaiian, Pacific Islander0.0%  Unlock0.2%
 Other  Unlock1.1%0.4%
 Two or More Races4.2%  Unlock3.2%
 Hispanic  Unlock28.8%18.4%
 space2
 Marriage & Family
 San Marcos, CACastaic, CAUnited States
 Married Population54.1%  Unlock49.8%
     Currently Married  Unlock58.5%48.0%
 Married but Separated1.4%  Unlock1.8%
 Single Population  Unlock40.4%50.2%
 Never Married31.5%  Unlock33.8%
 Divorced  Unlock7.0%10.8%
 Widowed5.2%  Unlock5.6%
 space5
 Household Size  Unlock3.192.60
 Households30,304  Unlock124,010,992
 Family Households  Unlock4,72780,755,759
     Married couple, w/children40.9%  Unlock30.5%
     Married couple, no children  Unlock41.1%42.9%
 Non Family Households7,787  Unlock43,255,233
     Single householder, w/children  Unlock6.5%15.8%
     Single householder, no children9.4%  Unlock10.8%
Voting
Reviews for San Marcos    5 Reviews
Kevin · San Marcos, CA
Best place I have ever lived.
Over 7 years ago

Just an amazing place to live. I have lived in 7 states and almost countless cities. Sam Marcos is one of the best. This is literally the longest place I have lived  More

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Norman · Vail, AZ
retiree location ?
Over 15 years ago

Is this area to expensive for the average income retired  More

   |    Reply
Greg · South Pasadena, CA
San Marcos Weather
Over 18 years ago

Beautiful Mediterranean climate with bright sunshine and ocean breazes. City is just 15 minutes away from the  More

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Reviews for Castaic    3 Reviews
Plasma · Castaic, CA
Pros and Cons
Over 9 years ago

I've lived in northern Castaic for 14 years so this review is for northern Castaic Pros: convenient freeway access, boating on Lake Castaic, lots of gas stations,  More

   |    Reply
Steve · Castaic, CA
Castaic
Over 11 years ago

Formerly a "truck stop" town, Castaic is the last town before going over the Grapevine, heading North on I-5 towards San Francisco. The town is unincorporated and sits  More

   |    Reply
Jayne · Valencia, CA
Safe to live?
Over 12 years ago

I currently live in Valencia. Before I consider purchasing a house in Castaic off Lake Hughes Rd and closer to the lake, is it safe to live in this neighborhood? Any  More

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Learn More About San Marcos, California
Overview
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