Here are your census listings. All were enumerated on 9 June 1870.
1870 Fed Census, Missouri twp, Brown Co, IL 58/58:
Samuel Lantz 21, farm laborer, b. PA, works for William Forsythe
1870 Fed Census, Missouri twp, Brown Co, IL 59/59:
Jane Lantz 50, b. Ireland
Robert lantz 26, farmer, b. MO, parents foreign born
Elisa Lantz 30, b. PA, parents foreign born
Jane Lantz 25, b. OH, parents foreign born
Margaret lantz 24, b. OH, parents foreign born
Martha Lantz 19, b. OH, parents foreign born
Alexander Lantz 17, b. IL, parents foreign born
1870 Fed Census, Missouri twp, Brown Co, IL 60/60:
Martin Lantz 55, farmer, b. PA, parents foreign born
Nancy Lantz 50, b. PA
Archibald Lantz 18, b. PA
Wellen Lantz 13, b. PA
1870 Fed Census, Missouri twp, Brown Co, IL 72/72:
John Lantz 35, farm laborer, b. PA
Elizabeth Lantz 26, b. KY
Walter Lantz 12, b. IL
Ira Lantz 9, b. IL
Ida Lantz 6, b. IL
Willa Lantz 3, b. IL
>From Marriage Return of Brown County, IL 1839-1861:
William R. Lantz md. Margaret Ann Mattox on 6 June 1861, Brown Co, IL.
I thought I would include this marriage. William & Margaret don't appear in the 1870 census. There are no other Lantz marriages in this volume. You might want to scan the IL Marriage Index. That might hold some clues.
Hope these are of help in your searching.
Brown County, IL Lookups//
> Hello Ken & Laurie,
> I would appreciate the LANTZ information on the 1870 census.
> LANTZ, Jane---M59
> LANTZ, John---M72
> LANTZ, Martin-M60
> LANTZ, Samuel-M58
> Thank you,
> Joy Trantham, AZ