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 the city of Pasadena, California, it is located approximately 14 miles from downtown Los Angeles. Its population was 42,846 at the 2020 census, before the entire town being evacuated d…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 the city of Pasadena, California, it is located approximately 14 miles from downtown Los Angeles. Its population was 42,846 at the 2020 census, before the entire town being evacuated during the Eaton Fire in 2025.
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