Wisconsin immigrants (Rud family)

Hello, I am looking for the place where my ancestors originally settled in Wisconsin. I heard it was around Madison but not sure. They were: John Pedersen Rud (wife Carrie/Kari/karen Gilbertson). they had 1 daughter, Mary (Maria) born in wisconsin in 1867 before they moved to MN in 1870. John immigrated in 1867, and Carrie in 1866/67. I searched 1870 census but found nothing. John P. Rud originally came from Malterud (lille) Farm in Vestre Toten, Oppland. Thank you, Mike