Did you see this posting? http://boards.rootsweb.com/localities.northam.usa.states.wis...
You need to piece those clues together.
WI Marriages -
Aloysius Kelnhofer 10 Jul 1873 Brown 03 0102
Theresia Dremel 10 Jul 1873 Brown 03 0102
You need to start your search in the last KNOWN location, which is Minnesota.
Minnesota Territorial and State Censuses, 1849-1905 has 24 KELNHOFERs
Hastings, Dakota, MN - Barbara Kelnhofer Feb 1827 Germany White Head; Barbara Kelnhofer May 1861 MN White Daughter