[1] Though signed as SR 42, it was officially Route 105 until it was replaced by the parallel Interstate 105 on October 14, 1993.

[2] The entire route was deleted from the California Freeway and Expressway System in 2000, with the remaining portion of SR 42 being relinquished to local jurisdictions in that year.

It jogged about two blocks to the north just west of Interstate 405, and back to the south after passing downtown Inglewood.

It then became Firestone Boulevard and passed through South Gate and Downey, and ended in Norwalk at a merge with Interstate 5 (the Santa Ana Freeway).

(US 101 and LR 2 left the current I-5 alignment north onto Anaheim Boulevard, eventually entering downtown Los Angeles via present State Route 72.)

[7] Around 1960, SR 10 was renumbered to State Route 42 due to the nearby Interstate 10 (numbered in 1957).

[1] Except where prefixed with a letter, postmiles were measured on the road as it was in 1964, based on the alignment that existed at the time, and do not necessarily reflect current mileage.