New York City Mayor Bill de Blasio (C) and NYPD Commissioner James P. O'Neill (L) march on Fifth Avenue at the St. Patrick's Day Parade in New York City on March 16, 2019. The New York City St. Patrick's Parade is the oldest and largest St. Patrick's Day Parade in the world. The first parade was held on March 17, 1762. Photo by Peter Foley/UPI