The Reno metro area is in the state of California and contains the zip code 91001. Los Angeles County is the primary location of zip code 91001. ALTADENA, California is the designated name for 91001 by the US Postal Service. Parts of zip code 91001 are located inside or close to the borders of Pasadena, California, and Altadena, California. Area codes 626 and 818 encompass zip code. In comparison to other zipcodes in California, 91001 can be categorised socioeconomically as a Middle Class class.

91001 is currently experiencing a 3.9 percent unemployment rate, which is higher than the current national unemployment rate of 3.9 percent and lower than the current county unemployment level of 5.3 percent.

The 2010 US Census shows that over the previous ten years, the population of 91001 fell from 36235 to 36126. While Hispanics make up the majority of the population in 91001, they also make up the majority of students in its public schools. In 91001 public schools, 62.9% of students participate in or are eligible for free or reduced lunch programmes.