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Sponsored Topics. Placentia is a city in northern Orange County, California. The population was 50,533 at the 2010 census, up from 46,488 at the 2000 census. This includes the community of Atwood, which is included in the city of Placentia, and is located in its southernmost quadrant.
5.2%. 4.3%. There are a total of 3 airports within 30 miles of Placentia and a total of 15 Amtrak train stations within 30 miles of the city center. The average travel time to work in Placentia is 1.1% less than the California average and 5.1% greater than the National average.