Top ten regions with the highest % of self-reported Italian ancestry:
(for the U.S. data from 1990 census, for Canada from 2016 census)

State/province - % Italians
1. USA Rhode Island - 20%
2. USA Connecticut - 19%
3. USA New Jersey - 19%
4. USA New York - 16%
5. USA Massachusetts - 14%
6. USA Pennsylvania - 12%
7. USA Delaware - 10%
8. CAN Ontario - 7%
9. USA New Hampshire - 7%
10. USA Nevada - 7%

Interestingly Ontario is an extension of U.S. heavily Italian North-East:

Also, Italians like to settle in French areas (Quebec, Louisiana, etc.):