Ortonville is an unincorporated community of Ventura County, California, United States. Ortonville is located along California State Route 33 4.8 miles northwest of Ventura. Ortonville lies north of the unincorporated community Wadstrom and south of the unincorporated community Weldons. All three were served by the 20th century Ventura and Ojai Valley Railroad. Two mobile home parks are just north of the site of this historical Place name; Canon De Las Encinas Park and Magnolia Park.