Post Office - Waterbury 135 Grand St Waterbury, CT 06701 Phone : (203) 574-6521 Post Office - Waterbury Business Category Post Offices Toll-Free           (800) ASK-USPS Fax           (203) 574-6588 Passport Application Services - Waterbury 135 Grand St Waterbury, CT 06701 Phone : (203) 574-6521 Business Category Passport Application Services Toll-Free           (800) ASK-USPS Fax           (203) 574-6588 United States Government--united States Postal Service, Post Offices, Waterbury Main Office, Postmaster Waterbury, CT 06702 Phone : (203) 574-6521 Business Category Government Offices-Federal Post Offices Government Offices & Public Schools