Below is a list of the official holidays of every U.S. state—plus Guam, Puerto Rico, and the U.S. Virgin Islands—on which state employees have the day off. This list does not include election-related days or federal holidays, even when given a different or additional name. For instance, while many states designate Washington's Birthday as Presidents' Day or Washington and Lincoln's Birthday, we don't include such variations below. It is helpful to know the dates of American public holidays, especially when making plans for hotel and transportation reservations. Many other non-statutory holidays are celebrated such as Valentine's Day (February 14), St. Patrick's Day (March 17), Mother's Day (second Sunday in May) and Halloween (October 31).