Stamps Postal Facts - U.S. Postal Service

Postage Stamps Are Protected by Copyright

The surprising origins of the postal service

5 Surprising U.S. Postal Service Facts

USPS Unveils Nancy Reagan Stamp - Newsroom

USPS Reaches for Final Frontier With New Priority Mail Stamps

USPS Reaches for Final Frontier With New Priority Mail Stamps - Newsroom

U.S. Postal Service Reveals Additional Stamps for 2024 - Newsroom - About. usps.com

Fun facts - Postal Facts - U.S. Postal Service

Just For Kids! National Postal Museum

Certified Mail Information

Stamps Printed - U.S. Postal Facts

Postal history - Postal Facts - U.S. Postal Service

Are U.S. special delivery stamps valid for postage?

Ten facts you should know about the U.S. Postal Service

Postal Facts updated for 2023 Source: USPS News Link - Postal Times