The majority of people
with the surname Koopmans
are born in April
and die in March
born dead
21.5% live in California
15.0% live in Iowa
13.1% live in Michigan
If you don't like people
called koopmans
you should probably move to
New Hampshire (None live there).
Interesting fact: Iowa
is the state with the most
last name koopmans per capita.
Check out the popularity
of the last name koopmans
for each state in the map below.
