USPS Tracking® is included at no charge for First-Class Package Service-Retail and First-Class Package Service-Commercial. Although First-Class Mail® postcards, letters, and flats are not eligible for USPS Tracking, those items are eligible for other extra services that provide barcodes for scanning.

Do USPS letters have tracking?

USPS Tracking service is represented by a bar code that is either printed on your shipping label or attached to your letter or package with a sticker. ... USPS Tracking is free when purchased at the Post Office.

How do I track a first class letter?

To use First Class Tracer, customers apply an adhesive barcode to the mailpiece directly below the postage stamp area on their envelope. Each barcode has a unique number that can be tracked on the usps.com site, similar to how you would use track a package using Delivery Confirmation or Signature Confirmation.