Simplify the following text for a Grade 11 native English-speaking person.
Original: Altadena is an unincorporated area and census-designated place in Los Angeles County , California , United States , approximately 14 m from the downtown Los Angeles Civic Center , and directly north of the city of Pasadena , California .
Simplified: Altadena is an unincorporated census-designated place of Los Angeles County in the state of California , in the United States .