Census look up or any information on this family or any Hempen family in Hannover would be appreciated

Henry Hempen: Laborer Age 52 Birthplace Hanover married birth range: 1827 - 1829
Lizzie Hempen: Wife Age 51 Birthplace Hanover married birth range 1826-1828
John Hempen (son) Porter Age 24 Birthplace Hanover single birth range 1855-1857
Henry Hempen: (son) Works in Planning Mill Age 13 Birthplace Hanover birth range 1866-1868
Lizzie Hempen: (daughter) Student Age 10 Birthplace Hanover single birth range 1869-1871
Annie Hempen (daughter) Student Age 7 Birthplace Hanover single birth range 1872 - 1874

The above information came from the 1880 USA Federal Census. I do not know when Henry (Heinrich) and his family came to the USA.
Given he was 52 in 1880 in 1852 he would have been around 27, 28, 29 if the records are accurate.

In the census records Hannover was spelled Hanover which is why I copied it that way above.

Thanks for any help anyone on this list can give me.

Laura Bozzay

Looking for Bozzay, Eufinger, Gebhardt (all spellings), Hempen, Horvath, Kerr, Kiss, Novak, Pennie, Penny, Reis or Reiss, Walter, and Woerner