23.0% live in New York
12.8% live in New Jersey
9.1% live in Pennsylvania and California
If you don't like people
called macmahon
you should probably move to
New Hampshire (None live there).
Interesting fact: New Jersey
is the state with the most
last name macmahon per capita.
Check out the popularity
of the last name macmahon
for each state in the map below.