Answer Hello Emi. We currently use United Parcel Service as our primary shipper. It is due to UPS restrictions regarding P.O. Boxes, that we cannot ship to P.O. Boxes at this time. If you absolutely must use a P.O. Box, please contact us at 1-877-477-7278 for assistance. Thank you. Read More... Answered by AppliancePartsPros.com | Friday, March 23, 2012