Many public institutions will close for Martin Luther King Jr. Day Monday, while some private businesses will remain open. Here's what to know.

Martin Luther King Jr. Day is observed in the United States on the third Monday of January. This year coincides with the inauguration of President-elect Donald Trump. Here is what to know about what businesses and services will remain open and which ones will take the day off.

Martin Luther King Jr. Day, this year celebrated on Jan. 20, was established as a holiday in 1983 to honor the legacy of the civil rights leader. Organizations across Long Island are offering opportunities for learning and service. Please call or email to confirm events.