ORANGE COUNTY ALMANAC : An Island Named Placentia
Placentia was incorporated in 1926, but its name was chosen by townspeople nearly 50 years earlier.
Resident Sarah Jane McFadden suggested that the original name, Cajon, be changed to Placentia.
Observers later speculated that McFadden came up with the name after hearing her mother tell about visits to an island named Placentia in Maine.
Source: “Placentia, a Pleasant Place,†by Virginia L. Carpenter
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