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The USPS follows the same holidays as the Federal Government. If the Federal Government is closed on Flag Day, then the USPS and the Post Offices are closed on Flag Day. Flag Day is not a Federal Holiday in the United States, therefore, the Post Office is not usually closed on Flag Day. However, the USPS is closed on Sundays. If Flag Day is on a Sunday, then the Post Offices of the USPS will be closed. Open? Choose another holiday or special day below to find out if the Post Offices of the United States Postal Service are open. 4th of July April Fool's Day Ash Wednesday Black Friday Chinese New Years Christmas Day Cinco de Mayo Columbus Day Easter Election Day Father's Day First Day of Ramadan First Sunday in Advent Flag Day Friday after Thanksgiving Good Friday Groundhog Day Halloween Independence Day Labor Day Mardi Gras Martin Luther King, Jr. birthday Memorial Day Mother's Day New Year's Day Palm Sunday Parent's Day Patriot Day President's Day Rosh Hashanah Shrove Tuesday St. Patrick's Day Thanksgiving Day United Nations Day Valentine's Day Veterans Day Washington's birthday Yom Kippur

More information from Research Maniacs: How much is a stamp First Class Letter Price and Postcard Price. United States Flags See pictures of all the decorative flags in America.