"... Luenzmann family from Neustadt? I have Johan, Johanna, and their children Carl and Louisa that came to Milwaukee, WI in 1845. Would like to hear from anyone that might be researching a related family."
You may find related families from research in Milwaukee's German newspapers. There are about 25 occurrences of Luenzmann / Lünzmann indexed from these papers collected in "Milwaukee's German Newspapers; an index of death notices and related items" (1844-1950).
There are multiple entries from multiple papers for a Louisa Luenzmann Odenbrett (Mrs. Joh. Heinr. Odenbrett), a Clara Luenzmann Wittenberg, and a Chas. Luenzmann.
Gary Rebholz, compiler/editor
Indexing Milwaukee's German newspapers continuously since 2007 ...