Postal Holidays for 2018 Shipping packages and buying stamps? Check out the 2018 USPS holidays for 2018: January 1 (New Year’s Day) January 15 (Dr. Martin Luther King Jr. Birthday) February 19 (Washington’s birthday) April 17 (Check your locations for extended hours for Tax Day) May 28 (Memorial Day) July 4 (Independence Day) September […]