Mount Signal is an unincorporated community located along State Route 98 about west of Calexico in the southern part of the Imperial Valley in Imperial County, California. The area is south of Interstate 8 and about north of the Mexico border. It lies at an elevation of 13 feet (4 m) below sea level. This is an agricultural area. There are a few homes and businesses and many irrigation canals and green fields. The Centinela Solar Energy Project is located here. Other nearby communities include Heber, El Centro, and Seeley.