Generally the Los Angeles Chapter covers Los Angeles County East of the Golden State Freeway and Santa Ana Freeway (I-5), and South and East of the ridge of the Santa Monica Mountains as far south as the Anderson Freeway (I-105).

By act of the Executive Board on 7/24/08, a petition to establish a Section in the new territory had been submitted.  It was approved.

Due to the dissolution of the Arrowhead Chapter, the Los Angeles Chapter now includes San Bernardino County East of Boron.