Patriots' Day is not a federal holiday, and therefore it does not affect mail service. The United States Postal Service (USPS) operates, delivers mail, and keeps post offices open on their normal schedule on this day nationwide.
The status of a holiday as either federal or state-level is the determining factor for USPS operations. Patriots' Day is an official state holiday only in Massachusetts and Maine, and a public school holiday in Wisconsin. Because it lacks federal designation, federal government agencies and services, including the USPS, do not observe it. This is distinct from federal holidays such as Independence Day or Thanksgiving, during which all USPS services are suspended across the entire country.
Consequently, individuals and businesses can expect regular mail delivery and full access to post office retail services on Patriots' Day. While state and local government offices, schools, and some private businesses may be closed in Massachusetts and Maine, all federal functions, including postal operations, proceed without interruption.
