Source: U.S. Census QuickFacts
The power and presence of Latinos in this community in Orange County — itself once a bastion of Republicanism — is echoed up and down the California coast. Latinos now make up just under 40 percent of the state’s population, projected to increase to 47 percent by 2050. The leaders of both houses of the Legislature are Latino, as is the secretary of state, the current mayor of Los Angeles and the previous mayor.
From 1940 census: How has Orange County changed? (Orange County Register, 8/21/2013)
The most instructive graphiic from the above article.
I was twice a resident of Orange County -- from August to November 1971 and June to August 1972 -- working as a cook at the Cottage Restaurant (now the Urth Caffe) in Laguna Beach. (The Cottage closed in late 2012.)
Postcard from Retiring Guy's collection