14.2% live in Pennsylvania
13.9% live in New York
8.3% live in Ohio, Michigan and North Dakota
If you don't like people
called rosencrans
you should probably go to
New Hampshire (None live there).
Cool fact: North Dakota
is the state with the most
last name rosencrans per capita.
Check out the popularity
of the last name rosencrans
for each state in the map below.