The United States Postal Service has installed self-serve kiosks called the Automated Postal Center (APC) in the lobbies of many post offices. Using a self-service APC is a convenient alternative to waiting in line for help at a full-service counter. APCs offer postal products, services, and even give zip code information.
There are more than 2,800 APCs in America. Most are located in the portion of a postal building that is open 24 hours, seven days per week.

APCs Offer the Following Services and Features:
Convenience & Ease of Use
APC kiosks are very convenient, easy to use, and save time. Just use the touchscreen and follow the instructions. For those who never used one before here is a video showing how to use one.
Choose a Delivery Service
Select a USPS delivery method from the choices of Priority Mail Express, Priority Mail, First-Class Mail, International Mail (under one pound), Parcel Post, and USPS Retail Ground services.
Payments Accepted
APC kiosks accept credit cards, debit cards, and EBT cash cards for payment and give a printed receipt for each transaction that includes a tracking number for each item mailed.
ZIP Code Lookup
Find a ZIP code by entering a street address and city.
Weigh a Letter or Package
Weigh a letter, large envelope, or a parcel (up to 70 lbs.).
Print Postage
Print out the correct postage based on the weight and the type of mailing service.
Buy Stamps
Stamps are available in convenient denominations and number of stamps.
Renew a Post Office Box Rental
If you’ve set up a PO box you can use an APC to process rental renewal.
Get Priority Mail Express Forms
Print out Express Mail forms.
Optional Services
Choose from the optional extra services that include Delivery Confirmation™ (with or without requiring a signature), insurance, certified mail, and return receipt requested.