Family records show buried in "Mound Cemetery". Although there are several cemeteries with the word mound in them, none really match. There may be an abandoned cemetery in Indian Mounds park that needs to be searched for.

UPDATE 02/15/13
Greenmount cemetery was original called Mount cemetery. Also his grave was listed as his sons grave (same full name). Son is buried nearby in unmarked grave.

April 12, 1848 applied for citizenship from St. Louis County, Missouri # F-155, showes he was 24 yrs of age and came from Hanover, Germany.
No record on 1860 Census

1870 Census 4th Ward, Quincy, Adams Co.,Ill.
Niehaus, Fred 48 Wood sawer Prussia
Caroline 46 Keeps house "
William 17 Teamster Illinois
Herman 9 "
Emma 5 "
Lena 1 "
Census, South 10th street

1880 Census
Niehaus, Fred 59 Wood sawer Prussia Prussia Prussia
Caroline 56 Wife " " "
Emma 15 Daughter Ill. " "
Lina 11 " " " "
Herman 19 Son,Cigar maker " " "

1900 Census 15th Precinct
Niehaus, Caroline 76 July 1824 Ger. Ger. Ger.

1861 lived at 166 State Street
1864-65 7 South 10th Street
1869-87 175 South 10th Street
1887-1906 521 South 10th Street

Adams County ILGenWeb Project

Early German Settlers in Adams County, Illinois

NIEHAUS, Frederick William - birth year: 1829 - Place of birth : Filsendorf, Westphalia - year arrived in Adams county: 1852 - 2
2 - Wilcox, David. Quincy and Adams County History and Representative Men. Chicago: Lewis, 1919.