The Newport Beach California Temple serves members of the Church in the following stakes:

Anaheim California
Anaheim California East
Cypress California
Fullerton California
Garden Grove California
Huntington Beach California
Huntington Beach California North
Irvine California
Laguna Niguel California
Mission Viejo California
Newport Beach California
Orange California
Placentia California
San Clemente California
Santa Ana California South (Spanish)
Santa Margarita California