The Laureen O”Neill-James School of Irish Dance performs on Constitution Avenue during the 2008 St. Patrick’s Parade. (Richard A. Lipski — The Washington Post)

The St. Patrick’s Day Parade in D.C. on Sunday will close several streets and lead to delays and crowding in the vicinity.

The parade will gather on the National Mall and head west on Constitution Avenue NW from 7th Street NW to 17th Street NW.

7th Street will be closed between Constitution Avenue NW and Independence Avenue SW from 9 a.m. to 3:30 p.m., according to D.C. police. The numbered streets between 7th and 17th streets NW that intersect with Constitution Avenue NW will also be closed during this period.