Sedco Hills is a former census-designated place (CDP) in Riverside County, California, United States.

Sedco Hills became part of the City of Wildomar upon its incorporation on July 1, 2008.

[1] According to the United States Census Bureau, the CDP has a total area of 1.6 square miles (4.1 km2), all of it land.

The name Sedco Hills has become the informal name of that section of the Temescal Mountains east of Sedco Hills, west of Cottonwood Canyon Creek and south of the San Jacinto River.

In the California State Legislature, Sedco Hills is in the 28th Senate District, represented by Democrat Lola Smallwood-Cuevas, and in the 67th Assembly District, represented by Democrat Sharon Quirk-Silva.