Fillmore is a small city in Ventura County, California, located in the Santa Clara River Valley, an agricultural corridor framed by mountains that stretches from Ventura County east toward Santa Clarita. The city's population is roughly 17,000, and the community is predominantly Hispanic or Latino, reflecting the valley's agricultural workforce and heritage. Fillmore was established in 1887, when the Southern Pacific Railroad built its main line through the Santa Clara River Valley on the route between San Francisco and Los Angeles. The town was named for J.A. Fillmore, a general superintendent for the railroad's Pacific system. The railroad defined Fillmore's early growth, and the valley's rich, fertile soil made citrus the foundation of the local economy, with packing houses shipping oranges along the rail line well into the 20th century. The Fillmore & Western Railway, which operates on the historic Southern Pacific right-of-way, recalls that citrus-hauling heritage today. The city's historic downtown preserves the character of its rail-and-agriculture origins, with early-20th-century buildings that have made it a sought-after filming location and a reminder of small-town Southern California. The Fillmore Historical Museum, housed in a restored 1887 Southern Pacific depot, interprets the town's founding, early settlers, railroad expansion, and citrus industry. State Route 126, which follows the valley, connects Fillmore to Ventura and the coast to the west and Santa Clarita to the east. Today, Fillmore functions as a family-oriented small town and a more affordable alternative to Ventura County's coastal cities. Its housing is modest and homeownership-oriented, and the community's identity remains tied to the orchards, farms, and rail heritage that shaped it. Fillmore appeals to families and residents seeking a slower pace, a walkable historic downtown, and convenient access to the coast and the broader Southern California region.