Martin Luther King Jr. Day, a federal holiday designated as a national day of service to encourage all Americans to volunteer and improve their communities, according to the National Museum of African American History and Culture.

Martin Luther King Jr. Day is a federal holiday, but some shipping and delivery services may still be operational. Here's what we know.

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Although Martin Luther King Jr. Day is one of 13 federal holidays that is observed, inauguration day is not a federal holiday. Only employees who work in Washington D.C. observe the day by having the day off.

MLK Day will be observed on Monday, Jan. 20 this year. U.S. Postal Service post offices will be closed on Monday, Jan. 20, and mail will not be delivered on the day, the USPS told USA TODAY. The USPS will resume regular operations on Tuesday, Jan. 21.

Monday is Martin Luther King Day. Here's what to know about the businesses and services that are closed for the holiday in Arizona.