The ZIP code 91423 in Los Angeles, California, with an area of 4.23 square miles, has experienced population fluctuations over the past decade. The population increased from 29,794 in 2010 to a peak of 32,784 in 2016, followed by a slight decline to 31,344 by 2022. The population density has consistently remained within the range of 7,000 to 7,800 people per square mile throughout this period.

Based on the 2022 population of 31,344 and an estimated 2.61 persons per household, which is the national average, the ZIP code is estimated to have approximately 12,009 housing units. This suggests a relatively dense residential development pattern within the area.

The high population density, exceeding 7,000 people per square mile, indicates that ZIP code 91423 falls within the urban classification. Urban areas are characterized by multi-story residential buildings, commercial buildings, and high levels of infrastructure and services. The lifestyle in such areas is typically fast-paced, diverse, and culturally rich, catering to individuals and families who enjoy vibrant city life with extensive public transport, restaurants, theaters, and museums.