According to the Census, there are 34.5 million Americans who list their heritage as either primarily or partially Irish. That number is, incidentally, seven times larger than the population of Ireland itself (4.68 million).
Reported in The Washington Post.
Barry, Sebastian. On Canaan's Side. [F BAR, AB/CD BAR]
Kerrigan, Kate. Ellis Island. [eBook
Toibin, Colm. Brooklyn. [F TOI, AB/CD TOI, eBook]
Troy, Peter. May the Road Rise Up to Meet You. [F TRO, AB/CD TRO]