The rolling celebration, now in its 264th year, takes place along Manhattan's famed Fifth Avenue. Some 150,000 take part in the march, according to organizers.
Major celebrations are also planned on Monday in Savannah, Georgia, and other American communities, though some of the cities most transformed by Irish immigration held festivities over the weekend.
Chicago 's St. Patrick's Day celebration, which is punctuated by turning its namesake river bright green with dye, happened Saturday. Boston and Philadelphia marked the occasion Sunday.
Across the pond, the Irish capital of Dublin culminates its three-day festival with a parade Monday. Cities such as Liverpool, England, another city transformed by Irish immigration, also host celebrations on the St. Patrick's feast day.
The parades are meant to commemorate Ireland's patron saint but have become a celebration of Irish heritage globally.
Festivities on March 17 were popularized by Irish immigrant communities, who in the 19th century faced discrimination and opposition in the U.S.
The New York parade dates to 1762 — 14 years before the U.S. Declaration of Independence.
It steps off at 11 a.m., heading north along Fifth Avenue and running from East 44th Street to East 79th Street in Manhattan.
A bevy of local politicians, from the mayor to the governor, are expected to walk the route along with school marching bands and traditional Irish pipe and drum ensembles and delegations from the New York Police Department and other organizations.
The grand marshal of this year’s parade in New York City is Michael Benn, the longtime chairman of the Queens County St. Patrick’s Parade held in Rockaway Beach.
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