Hi again Darwin. Hope this will help.
1870 census, Farmersburg, Clayton County, Iowa, August 11,
Page 20, Lines 9-15, Dwelling 129, Family 134
Knockermus, Godfried, Male, 48 years old, Farmer, $3200 Real Estate Value, $1094 Personal Value, Born Prussia
Knockermus, Elizabeth, Female, 40 years old, Keeping House, Born Prussia
Knockermus, Doras, 20 years old, Female, At Home, Born Prussia
Knockermus, Fredericka, 13 years old, Female, At Home, Born Prussia
Knockermus, Louisa, 12 years old, Female, At Home, Born Prussia
Knockermus, August, 4 years old, Male, At Home, Born Prussia
Knockermus, Frederick, 2 years old, Male, At Home, Born Iowa
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1880 census, Farmersburg, Clayton County, Iowa, June 9,
Page 342A, Lines 1-6, Dwelling 66, Family 67, ED 132
Knucmous, Godfrey, Male, 58 years old, Head, Farmer, Born Prussia, Parents born Prussia.
Knucmous, Elizabeth, Female, 49 years old, Wife, Keeping House, Born Prussia, Parents born Prussia.
Knucmous, August, Male, 14 years old, Son, Work At Home, Born Prussia, Parents born Prussia.
Knucmous, Fritz, Male, 11 years old, Son, Work on Farm, Born Iowa, Parents born Prussia.
Knucmous, Emma, Female, 8 years old, Daughter, Born Iowa, Parents born Prussia.
Knucmous, John, Male, 3 years old, Grandchild, Born Iowa, Parents born Prussia.