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2025 Compare Cities People:
Simi Valley, CA vs Altadena, CA

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Highlights
- Altadena is 0% more densely populated than Simi Valley.
- People are 1.3% less likely to be married in Altadena.
- The Median Age is 2.9 years older in Altadena.
 Simi Valley, CAAltadena, CAUnited States
 Population  Unlock43,384329,725,481
 Female Population51.0%  Unlock50.5%
 Male Population49.1%  Unlock49.5%
 Median Age  Unlock43.938.4
 space3
 Population - 2010124,424  Unlock309,327,143
 Population - 2000  Unlock42,610285,036,114
 Population - 1990100,217  Unlock251,960,433
 Pop. 2000 to Now  Unlock4.8%15.6%
 Pop. 1990 to Now24.9%  Unlock30.8%
 space4
 Population Density  Unlock5,124.593.4
 Land Area41.5  Unlock3,531,905.4
 Water Area  Unlock0.0264,836.8
 space
 Est. Total Population By Age
 Simi Valley, CAAltadena, CAUnited States
 Age 0 to 45.2%  Unlock5.9%
 Age 5 to 9  Unlock5.5%6.1%
 Age 10 to 146.6%  Unlock6.6%
 Age 15 to 17  Unlock3.5%3.9%
 Age 18 to 203.8%  Unlock4.0%
 Age 21 to 24  Unlock3.4%5.2%
 Age 25 to 3413.3%  Unlock13.8%
 Age 35 to 44  Unlock13.0%12.9%
 Age 45 to 5414.8%  Unlock12.6%
 Age 55 to 59  Unlock8.2%6.7%
 Age 60 to 646.7%  Unlock6.3%
 Age 65 to 74  Unlock10.5%9.6%
 Age 75 to 844.5%  Unlock4.5%
 Age 85 and over  Unlock2.7%1.9%
 space1
 Race
 Simi Valley, CAAltadena, CAUnited States
 White57.6%  Unlock59.4%
 Black  Unlock19.8%12.2%
 Asian11.1%  Unlock5.6%
 Native American  Unlock0.1%0.6%
 Hawaiian, Pacific Islander0.1%  Unlock0.2%
 Other  Unlock0.4%0.4%
 Two or More Races3.8%  Unlock3.2%
 Hispanic  Unlock29.3%18.4%
 space2
 Marriage & Family
 Simi Valley, CAAltadena, CAUnited States
 Married Population50.5%  Unlock49.8%
     Currently Married  Unlock48.0%48.0%
 Married but Separated1.4%  Unlock1.8%
 Single Population  Unlock50.2%50.2%
 Never Married33.6%  Unlock33.8%
 Divorced  Unlock11.3%10.8%
 Widowed5.9%  Unlock5.6%
 space5
 Household Size  Unlock2.892.60
 Households43,893  Unlock124,010,992
 Family Households  Unlock10,75380,755,759
     Married couple, w/children32.3%  Unlock30.5%
     Married couple, no children  Unlock42.0%42.9%
 Non Family Households12,928  Unlock43,255,233
     Single householder, w/children  Unlock14.4%15.8%
     Single householder, no children12.8%  Unlock10.8%
Voting
Reviews for Simi Valley    22 Reviews
Arnold · Simi Valley, CA
Growing Challenges- housing costs and still the "
Over 4 years ago

I've live in two different neighborhoods since fall of 1996 and depending on the neighborhood you're quality of life experience will vary. The price of housing is such  More

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Joseph · Simi Valley, CA
Great city(Little Pricey)
Over 15 years ago

I have lived in Simi Valley for 23 Years. I love it here but due to the cost of living am looking to relocate to another state/City where my money will go further. Simi  More

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john · Simi Valley, CA
good place to live
Over 16 years ago

simi valley is a very nice place to live within the shadow of the LA metro area. it has low crime and reasonable housing costs with ready access to indoor and outdoor  More

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Reviews for Altadena    1 Reviews
Les · Altadena, CA
Altadena: High and Dry in L.A.
Over 15 years ago

I live just above the 1500 foot elevation at the edge of the San Gabriel Mountains in the L.A. suburb of Altadena--just above Pasadena. We're above the low morning fog  More

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