On days when the federal government isn't doing business, neither is the post office. The U.S. Postal Service follows the same holiday schedule as federal offices.
In 2020, mail won't be delivered on Sundays, nor the following dates: Jan. 1, Jan. 20, Feb. 17, May 25, July 4, Sept. 7, Oct. 12, Nov. 11, Nov. 26, Dec. 25.
Please keep in mind that occasionally, particularly near holidays, your local post office may be open, but closes earlier in the day than usual. Note that Independence Day falls on a Saturday in 2020 and July 4 is still the date of closure. Post offices will be open July 3.
Here's a complete list a complete list of federal postal holidays and the corresponding dates in 2020 when post offices will be closed:
Download the entire list of post office holidays as a PDF