The United States Postal Service (USPS) is a federal agency charged with providing mail delivery services across the country. However, there are other ways to refer to this organization. Some popular synonyms for the USPS include the US Mail, United States Mail Service, and the Post Office. These terms all evoke the same image of a reliable and trustworthy service that is essential for the functioning of our society. Whether you call it the USPS, the US Mail, or the Post Office, the important thing is that this vital institution continues to provide excellent service to its millions of customers every day.