60.0% live in Pennsylvania
20.0% live in New Jersey
6.7% live in New York, Michigan and Oregon
If you don't like people
called montecarlo
you should probably move to
New Hampshire (None live there).
Interesting fact: Pennsylvania
is the state with the most
last name montecarlo per capita.
Check out the popularity
of the last name montecarlo
for each state in the map below.