Explore Placentia local geography, civic resources and voter guides, with dated official population and registration facts for Orange County.
At a glance: Placentia is an incorporated city in Orange County. Population: 53,613 (California Department of Finance estimate as of January 1, 2026). Registered voters: 33,284 (California Secretary of State, as of September 4, 2026).
Placentia’s citrus and railway history gives this northern Orange County city a distinctive local story. Its official historical-resources account describes the Santa Fe Railroad’s route through the community in 1910, followed by a station and packing houses serving agricultural shipments. That history explains the relationship between transport and town growth without implying that a proposed modern station or project is already complete. The city’s name came through the school district: the official history records a change from Cajon School District to Placentia School District in 1878 and explains the Latin connection to “a pleasant place.” Bradford and Melrose avenues also preserve names from the early town layout. Streets, school history and civic identity overlap here, but today’s school district remains a separate jurisdiction. Placentia records incorporation on December 2, 1926 and later adoption of a city charter in 1965. Its Development Services historical-resources page directs readers to the Placentia Public Library’s History Room for more local material. Municipal planning records provide the current context for a proposal; historical agricultural and population descriptions should remain attached to their original periods.
The official city history describes the Santa Fe route through Placentia in 1910 and the station and packing houses that supported local agricultural shipments.
The city traces it to the school district’s 1878 name change, derived from Latin meaning a pleasant place.
The city’s historical-resources page directs readers to the Placentia History Room in the Public Library and the Development Services Department.
33,284 (California Secretary of State, as of September 4, 2026).
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