California 19 is located entirely within the Los Angeles basin, originating at a traffic circle with California 1 in Long Beach and extending north via Lakewood Boulevard and Rosemead Boulevard through Lakewood, Bellflower, Paramount, Downey, Pico Rivera, Rosemead, Temple City, and East Pasadena. Portions of the route have been decommissioned to local control, including the southernmost segment at California 1/Pacific Coast Highway. However, signage generally remains in place.
The section of California 19 north of Pico Rivera is technically California 164, but it is signed as California 19 to allow for route continuity. California 164 is planned to someday connect the northern section of California 19 directly with Interstate 605, thus offering a freeway that travels due north to Interstate 210 (rather than turn northeast as Interstate 605 currently does). However, it is unlikely that this freeway connection would ever be constructed.
