USPS

USPS is the United States Postal Service's official website for mailing and shipping services. Users can track eligible items, find post offices and ZIP codes, review postal products, and access supported label or delivery-management tools.

Prices, mail classes, delivery estimates, address changes, and account features have specific conditions. A tracking status is information about a particular postal item, not a guarantee that every service delivers on the same schedule. Commercial carriers such as UPS and FedEx are separate organizations.