Hours Of Operations 3M Company California Monrovia 3M Company Hours of Operation and Locations in Monrovia, CA 4.5 - 34 votes 1 Locations in Monrovia www.3m.com 3M Company Hours Category: Home & Garden 3M Company - Monrovia, CA 91016 1601 S Shamrock Ave(626) 358-0136 View Store Details Explore MonroviaView More Apparel MarshallsRoss Dress for LessCarter'sKohl's OutletTalbots Sports 24 Hour FitnessG's Fashion Jewelry MarshallsKohl's OutletAvon Recommend For You 5th Avenue Salon 7 Day Anyplace A Locksmith 90's Nails 99 Cents Plus A & A Locksmith A & B Construction A & B Roofing A & J Construction A & K Railroad Materials Incorporated A & M Construction