This looks like it could be Adolph:

1860 Quincy Ward 5, Adams, Illinois
FISHER, Julia 1810 (50) Preuben
Adolph 1837 Preuben (cooper)
TURNER, Anna 21 IL
TURNER, Wm 27 CONN (carpenter)
BURNS, Nancy 31 AL

1870 Quincy Ward 1, Adams, Illinois
FEHR, Julia 1810 Hanover
Adolf 1837 Hanover
Johanna 1846 Hanover

1880 Quincy, Adams, Illinois
FUEHR, Adoph 44 Prussia (cooper)
Anna 31 Prussia
Fredrick 5 IL
Minnie 2 IL
Julia 70 Prussia (mother)wd
Johanna 34 Prussia (sister)

1900 Quincy Ward 5, Adams, Illinois
(indexed as FUCHS, but it really is spelled as below)
FUEHR, Adolph Dec 1836 63 M:26yrs. GER GER GER IM:1857 Janitor
Anna Sep 1848 51 8/chi/6/liv GER GER GER IM:1872
Fred Jun 1875 24 IL GER GER Butcher
Minnie Nov 1878 21 IL GER GER Sales Lady
Charles May 1883 17 IL * Delivery Boy
Clara Jan 1885 15 IL *
William Jan 1887 13 IL * at school
Julia Dec 1888 11 IL * at school

Hopefully this help you a little bit. Looks like they must have been married in IL, unless he traveled to GER to marry her and bring her back.

I didn't look for her in the immigration records.