Postal holiday

In the United States, a postal holiday is a federal holiday recognized by the United States Postal Service, during which no regular mail is delivered, however Priority Mail Express items will still be delivered as that service functions year round.

Though letter carriers have the day off, some postal workers are required to work on holidays, such as clerks dispatching mail, or those working in plant distribution facilities. Some plant facilities operate 365 days a year. Also, RCAs (Rural Carrier Associate) and CCAs (City Carrier Assistant) in offices that handle parcels for Amazon may work Sundays and/or holidays delivering for Amazon, but this also depends on relative seniority and staffing.

Part 608, section 3.2 of the DMM (U.S. Domestic Mail Manual) groups holidays into "Widely Observed" and "Not Widely Observed". Holidays "Widely Observed" include New Year’s Day, Memorial Day, Independence Day, Labor Day, Martin Luther King Jr. Day, Thanksgiving Day, and Christmas Day. Holidays "Not Widely Observed" are Presidents’ Day, Columbus Day, and Veterans Day.

If a holiday occurs on Sunday, the holiday will be observed on Monday.

List of holidays
The eleven postal holidays are:

This list is nearly identical to the list of Federal holidays, but does not include inauguration day. If a postal holiday falls on a Sunday, it is observed on the following Monday.

Canada Post also maintains a list of Postal Holidays.