Smithtown Post Office 3 years ago ID: #425056 Listed In : Business & Services Courier Services Government Offices 25 Route 111, Smithtown, NY 11787 631-360-6709 https://postofficeshours.com/ny/smithtown/smithtown/ [email protected] Business Description San Francisco Post Office in San Francisco County, CA 94124. USPS Post office locations hours and phone numbers. Reviews & Ratings Write a Review No Review. Please login / register to add your review. Tags : post office Smithtown NY Post Office Smithtown Post Office