Post Office - Warminster 1135 Mearns Rd Warminster, PA 18974 Phone : (215) 672-8874 Business Category Post Offices Toll-Free           (800) ASK-USPS Fax           (215) 672-2285 Automated Postal Center - Warminster 1135 Mearns Rd Warminster, PA 18974 Phone : (215) 672-8874 Business Category Automated Postal Centers Toll-Free           (800) ASK-USPS Fax           (215) 672-2285