Placentia, California City Citrus groves in Placentia, 1961 Seal Motto(s): "A pleasant place to live."[1] Location of Placentia within Orange County, California. Placentia, California Location in the United States Coordinates: 33°52′57″N 117°51′18″W Country United States State California County Orange Incorporated December 2, 1926[2] Government • City council Mayor Craig Green Mayor Pro Tem Chad P. Wanke Rhonda Shader Ward Smith Jeremy B. Yamaguchi[3] • Treasurer Kevin Larson[4] • City clerk Patrick J. Melia[5] • City administrator Damien Arrula[6] Area[7] • Total 6.63 sq mi (17.17 km2) • Land 6.61 sq mi (17.13 km2) • Water 0.01 sq mi (0.04 km2) 0.22% Elevation[8] 272 ft (83 m) Population (2010)[9] • Total 50,533 • Estimate (2016)[10] 52,228 • Density 7,896.58/sq mi (3,049.04/km2) Time zone Pacific (UTC-8) • Summer (DST) PDT (UTC-7) ZIP codes 92870–92871 Area code 714 FIPS code 06-57526 GNIS feature IDs 1661237, 2411432 Website www.placentia.org