Yes, the United States Postal Service (USPS) is an independent agency of the United States government responsible for providing postal service throughout the United States, including on Christmas. Although USPS offices are closed on Christmas Day, the organization still delivers mail and packages on Christmas and other holidays. USPS employees, including letter carriers and postal workers, work hard to ensure that millions of people receive important mail and packages on time. USPS is one of the few major organizations that operates 365 days a year.