My name is Sherry Brosdahl. I am married to Brad Brosdahl who was adopted by Arlyn Thomas and Elaine Emelie Brosdahl (maiden Westcott). Most all of their family is from northern Iowa.
There are also numerous Brosdahl's in Minnesota. Gene Brosdahl and James Brosdahl passed away in 2011.
The family names runs deep in Northern Iowa (Fertile, Iowa, Lake Mills, Iowa, etc)
Hope this gives some assistance in finding what you are looking for.