In 1846, the area that is now Norco was part of a Mexican Grant from Mexico to Vicenta Sepulveda and was called the Little La Sierra Rancho. The area passed through several owners including the San Jacinto Land Company. James W. Long purchased the Norco area land around 1908. He organized the Orange Heights Water Company. Development began and in 1910 the area became a subdivision of the Corona Land Company for citrus growing. In 1921, the property was purchased by the North Corona Land Company.