Passport Application Services - Affton 55 Grasso Plz Saint Louis, MO 63123 Phone : (314) 631-4154 Business Category Passport Application Services Toll-Free           (800) ASK-USPS Post Office - Affton 55 Grasso Plz Saint Louis, MO 63123 Phone : (314) 631-4154 Business Category Post Offices Toll-Free           (800) ASK-USPS