United States Government--postal Service 23525 Avenue 56 Ducor, CA 93218 Phone : (559) 534-2440 Business Category Government Offices & Public Schools Post Office - Ducor 23318 Avenue 56 Ducor, CA 93218 Phone : (559) 534-2440 Post Office - Ducor Business Category Post Offices Toll-Free           (800) ASK-USPS