Contact Us Mark Twain Insurance Services has two offices, serving the Central Valley and the Mother Lode. Our main location is in Stockton, with a branch office in Angels Camp. Call 1-800-350-7700 or send an Email to us here at Mark Twain Insurance Services   ANGELS CAMP OFFICE       178 N Main St Angels Camp, CA 95222 Click here for Directions Mailing Address: P.O. Box 610 Angels Camp, CA 95222-0610   (209) 736-2200 (877) 736-2200 (209) 954-0800 Fax (877) 577-1722 Fax   STOCKTON OFFICE       7337 Pacific Avenue Stockton, CA 95207-1924 Click here for Directions   (209) 954-1000 (800) 350-7700 (209) 954-0800 Fax (877) 577-1722 Fax   We want to be your agent for Life.