What city in America has a large Irish population?

Massachusetts had nearly double the national average of Irish immigrants, and today has a large population of the descendants of those immigrants. Many Irish immigrants moved to Boston in the 1840s-1860s in search of work because they were told the streets were paved with gold. The potato famine of the 1840s is a major cause for this as well. In addition to Massachusetts, many Irish immigrants settled in New York City and in Philadelphia.

Interestingly, New York State has the highest percentage of Gaelic speakers.