Area Code 858 January 18, 2021 allcitycodes Telephone Codes 0 Where is area code 858 located? Below you will find a list of all cities covered by area code 858 in California. Del Mar, CA La Jolla, CA Poway, CA Solana Beach, CA Read more:Area Code 718Area Code 815Area Code 810Area Code 816Area Code 812Area Code 804Area Code 813Area Code 715Area Code 770Area Code 719