Boston has the reputation of being very Irish, moreso than Italian. Still has alot though. Providence likewise, and its not nearly as large as Baltimore or Chicago. NY and NJ have the most (statewise), with PA next.
Statistics
By Total Number
City Number Percent
1 New York, NY 1,882,396 8.184%
2 Philadelphia, PA 497,721 8.159%
3 Chicago, IL 492,158 5.181%
4 Boston, MA 485,761 9.991%
5 Pittsburgh, PA 316,351 13.181%
6 Los Angeles/Long Beach, CA 308,409 1.814%
7 Detroit, MI 280,051 6.511%
8 Cleveland, OH 179,733 8.559%
9 Rochester,NY 170,910 13.146%
10 Washington, D.C. 163,440 2.972%
By Percent
City Number Percent
1 Pittsburgh, PA 316,351 13.181%
2 Rochester,NY 170,910 13.146%
3 Boston, MA 485,761 9.991%
4 Cleveland, OH 179,733 8.559%
5 New York, NY 1,882,396 8.184%
6 Philadelphia, PA 497,721 8.159%
7 Detroit, MI 280,051 6.511%
8 Chicago, IL 492,158 5.181%
9 Washington, D.C. 163,440 2.972%
10 Los Angeles/Long Beach, CA 308,409 1.814%
Surprised Rochester and Pittsburgh have such high percents. Most likely since they are less diverse of areas.