Wildomar is a city in Riverside County, California, United States. The city is located in a fast-growing area. As of the 2010 census, the population of Wildomar was 32,176, an increase from 14,064 at the 2000 census, when the community was still an unincorporated census-designated place. Wildomar was almost a forgotten community. Then, in 1985, the Temecula Valley Freeway (I-15) was completed, bringing with it a new wave of interest in the area. Once again, Wildomar had begun to grow and experience new prosperity. Wildomar became the 25th city in Riverside County on July 1, 2008.