Posted on: Polk County Queries Reply Here: http://genconnect.rootsweb.com/gc/USA/Mn/Polk/10510 Surname: Christofferson ------------------------- In the phonebook for Grand Forks (ND)/East Grand Forks (MN) is listed a David Christofferson, 631 4th Street North, Grand Forks, ND, 58201, 701/772-7176. It is a long shot, but given how our Norwegian ancestors changed their last names, you might want to try contacting.