Temescal Valley, California is an unincorporated but census-designated area in Riverside County at the southernmost end of Corona city limits, and is included in the city’s sphere of influence. It includes the neighborhoods of Sycamore Creek, Trilogy, The Retreat and Horsethief Canyon Ranch. As of 2013, the City of Corona has applied for annexation of the area through the Riverside County Local Agency Formation Commission (LAFCO). On September 26, 2013, the Commission formally denied the City of Corona’s request for annexation. The contract between Corona and the County to provide its emergency services to the northern-third of Temescal Valley persists. Although the arguments of the opponents of annexation included the fear of being “Coronians” and losing the area’s identity, Temescal Valley’s ZIP Code remains associated with Corona, CA.
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