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2026 Compare Cities People:
Alton, IL vs San Marcos, CA

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Highlights
- San Marcos is 0% more densely populated than Alton.
- People are 48.0% more likely to be married in San Marcos.
- The Median Age is 2.5 years younger in San Marcos.
 Alton, ILSan Marcos, CAUnited States
 Population  Unlock94,313329,725,481
 Female Population52.2%  Unlock50.5%
 Male Population47.8%  Unlock49.5%
 Median Age  Unlock35.638.4
 space3
 Population - 201027,901  Unlock309,327,143
 Population - 2000  Unlock54,977285,036,114
 Population - 199032,905  Unlock251,960,433
 Pop. 2000 to Now  Unlock77.3%15.6%
 Pop. 1990 to Now-20.8%  Unlock30.8%
 space4
 Population Density  Unlock3,872.393.4
 Land Area15.5  Unlock3,531,905.4
 Water Area  Unlock0.0264,836.8
 space
 Est. Total Population By Age
 Alton, ILSan Marcos, CAUnited States
 Age 0 to 45.5%  Unlock5.9%
 Age 5 to 9  Unlock8.0%6.1%
 Age 10 to 147.2%  Unlock6.6%
 Age 15 to 17  Unlock3.5%3.9%
 Age 18 to 203.5%  Unlock4.0%
 Age 21 to 24  Unlock4.5%5.2%
 Age 25 to 3414.5%  Unlock13.8%
 Age 35 to 44  Unlock15.9%12.9%
 Age 45 to 5411.7%  Unlock12.6%
 Age 55 to 59  Unlock5.5%6.7%
 Age 60 to 647.3%  Unlock6.3%
 Age 65 to 74  Unlock7.5%9.6%
 Age 75 to 844.4%  Unlock4.5%
 Age 85 and over  Unlock1.8%1.9%
 space1
 Race
 Alton, ILSan Marcos, CAUnited States
 White67.1%  Unlock59.4%
 Black  Unlock1.5%12.2%
 Asian0.6%  Unlock5.6%
 Native American  Unlock0.3%0.6%
 Hawaiian, Pacific Islander0.0%  Unlock0.2%
 Other  Unlock0.2%0.4%
 Two or More Races5.0%  Unlock3.2%
 Hispanic  Unlock39.7%18.4%
 space2
 Marriage & Family
 Alton, ILSan Marcos, CAUnited States
 Married Population36.6%  Unlock49.8%
     Currently Married  Unlock52.7%48.0%
 Married but Separated2.8%  Unlock1.8%
 Single Population  Unlock45.9%50.2%
 Never Married37.6%  Unlock33.8%
 Divorced  Unlock9.1%10.8%
 Widowed8.7%  Unlock5.6%
 space5
 Household Size  Unlock3.082.60
 Households11,097  Unlock124,010,992
 Family Households  Unlock22,51780,755,759
     Married couple, w/children23.2%  Unlock30.5%
     Married couple, no children  Unlock35.3%42.9%
 Non Family Households5,244  Unlock43,255,233
     Single householder, w/children  Unlock14.4%15.8%
     Single householder, no children13.3%  Unlock10.8%
Voting
Reviews for Alton    7 Reviews
Tim · Alton, IL
Headed in the right direction. Come join us!
Over 3 years ago

My wife, daughter, and I moved here from Phoenix Metro March 2022 and have been very happy with our move. The people have been great, having four seasons is great, and  More

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Jeanie · Alton, IL
I Love It
Over 3 years ago

Not sure why such low reviews. I moved here from St. Louis. Crime in Alton is NOTHING compared to that. Maybe 1 or 2 homicides a year and those are generally people  More

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Lindsie · Alton, IL
Alton, IL
Over 11 years ago

Unfortunately, Alton has become a run down, poverty stricken area. Jobs are very limited and do not pay well. Unless you plan on commuting to St. Louis for work, you  More

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Reviews for San Marcos    5 Reviews
Kevin · San Marcos, CA
Best place I have ever lived.
Over 8 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 16 years ago

Is this area to expensive for the average income retired  More

   |    Reply
Greg · South Pasadena, CA
San Marcos Weather
Over 19 years ago

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

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Learn More About Alton, Illinois
Overview
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Learn More About San Marcos, California
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