Information needed (search's/look-ups) on German Surnames

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1.) Requesting OSB look-up (in Bavaria, Germany town unknown) on the surname " Johann and Anna ( geb. BROCK) SCHROEPFER" born 1835. Johann and Anna immigrated in 1839 to  town in Germany is unknown. Help of any kind would be welcome......... any thoughts on how to pursue this would also be welcome.  Information below is from the 1870 NYC Census.          

1870 NYC Federal Census
Schropper
John, 35, born Bavaria, naturalized, occup: Lager Beir Saloon
Anna, 32, b.Hesse Darmstadt
Frank, 7, b.NY    "Frank is the key name"
George, 6, b.NY
Barbara, 4, b.NY
John, 2, b.NY
 
1900 Jersey City, NJ census
Schroepfer, John, birthdate July 1835, age 64, he and parents born Germany
yr of immigration to US: 1839, naturalized.
 
Years ago I found this:
Schroepffer, John,  age 28, Port of Departure: Bremen, Country of Origin: Deutschland, Ship Name: Caroline, Port of Arrival: NY, Date of Arrival: Sep 2, 1840.
                                                                            Ann Borden .........  Bootsynj@comcast.net

 

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