The alphamegalog of the cities of California lists the largest city in California for each letter of the alphabet. In this case, ‘largest’ is based on population within the city proper.

Anaheim
Bakersfield
Chula Vista
Downey
Elk Grove
Fresno
Glendale
Huntington Beach
Irvine
Jurupa Valley
King City
Los Angeles
Modesto
Norwalk
Oakland
Palmdale
Quartz Hill
Riverside
San Diego
Torrance
Upland
Visalia
West Covina
(no X)
Yorba Linda
Zayante