Cities in the new 23rd district include Victorville, Hesperia, Adelanto, Apple Valley, Barstow, Twentynine Palms, Big Bear Lake, California City, Loma Linda, Yucaipa, southern Redlands, and small portions of Highland and San Bernardino.

[3] It also has one of the highest active-duty military populations in the country, containing Fort Irwin National Training Center, Marine Corps Logistics Base Barstow, and Marine Corps Air Ground Combat Center Twentynine Palms.

From 2003 to 2013 the district ran along the Pacific coasts of Ventura, Santa Barbara, and San Luis Obispo counties.

Major cities in the district included Santa Barbara, San Luis Obispo, Ventura, and Oxnard.

As of the 2020 redistricting, California's 23rd congressional district is located in the region of the state covering the Mojave Desert.