30.5 million US residents claim Irish ancestry, the second most frequently reported ancestry, according to the Census Bureau’s Ancestry 2000 report.
4.2 million, roughly, is the population of Ireland.
248 is the number of consecutive years New York City has put on its St. Patricks Day parade.
24 percent of Massachusetts residents have Irish ancestry, says the Census Bureau.
9 cities or towns in the United States are named Dublin (also from the Census Bureau).
0 is the number of snake species native to Ireland (which has more to do with geography than St. Patrick, if you ask the National Zoo).
And you’ll find innumerable tips and resources for tracing your Irish roots in our Irish genealogy research toolkit.