MLK Jr. Day is a federal holiday, so most government offices across the nation are closed and the Postal Service won't be delivering mail.

Organizations across the NYC area are marking MLK Day with special events honoring the civil rights leader's legacy.

What’s open and closed on Martin Luther King Jr. Day? This is the only federal holiday designated as a national day of service to encourage all Americans to volunteer to improve their communities. The federal holiday honoring the civil rights leader was established in 1983 and was first observed nationwide in 1986.