Post Office - Piru 652 N Main St Piru, CA 93040 Phone : (805) 521-1172 Post Office - Piru Business Category Post Offices Toll-Free           (800) ASK-USPS Fax           (805) 988-5604 United States Government--postal Service, Suburban Offices, Piru 652 N Main St Piru, CA 93040 Phone : (805) 521-1172 Business Category Government Offices-Federal Government Offices & Public Schools