Altadena is an unincorporated area and census-designated place in the San Gabriel Valley and the Verdugos regions of Los Angeles County, California. Directly north of Pasadena, it is located approximately 14 miles (23 km) from Downtown Los Angeles. Its population was 42,846 at the 2020 census, up slightly from a 2010 figure of 42,777. In early 2025, the community was severely impacted by the Eaton Fire.
Pacific
Altadena
Los Angeles County, CA
Population
42,719
Walk Score
83 · Very Walkable
Median rent
$2,127
Median home value
$991,200
Founded
1887
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On the National Register
Historic districts
- Farnsworth, Gen. Charles S., County Park · listed 1997
- Grey, Zane, Estate · listed 2002
Notable landmarks
- Christmas Tree Lane · listed 1990
- Crank House · listed 1997
- Keyes Bungalow · listed 1978
- McNally, Andrew, House · listed 2007
- Mount Lowe Railway · listed 1993
- Mount Lowe Railway District (Boundary Increase) · listed 2015
- Pacific Electric Railway Company Substation No. 8 · listed 1977
- Scripps Hall · listed 1999
- Valentine, Walter D., Cottage B · listed 2017
- Villa Carlotta · listed 2014
- Woodbury-Story House · listed 1993
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