Humboldt County’s Ten Largest Faith Groups 2010 Religious Group Number of temples, mosques, churches, or synagogues Number of adherents % of total population Roman Catholic 13 9,901 7.35 Mormon 7 3,557 2.64 …

Contra Costa County’s Ten Largest Faith Groups 2010 Religious Group Number of temples, mosques, churches, or synagogues Number of adherents % of total population Roman Catholic 34 228,400 21.77 Nondenominational 72 26,080 …