Mercury Insurance Claims & Payments Mercury General Corporation is a multiple-line insurance organization. Automobile, homeowners, renters and business insurance. Founded in 1961 and headquartered in Los Angeles. 800-503-3724 Claims P.O. Box 11991Santa Ana, CA 92711 Click for Claims Website 800-503-3724 Payments P.O. Box 11991Santa Ana, CA 92711 Click for Payments Website