1.  Anon.  1966.  Marriage Index:  Ohio, 1789-1850.  Liahona Research, Orem, UT (Broderbund CD-400):  not found.

2.  1840:  in PA or OH

3.  1850 Census Index/Images (online at Ancestry.com; Image #16 of 312):  Private Boarding House, Cincinnati, 10th Ward, Hamilton Co., OH, p. 8B, 68/130, enumerated 19 Jul 1850, official enumeration date 1 Jun 1850 (extracted by Diana Gale Matthiesen):¤•

John Kopp	34	M		Laborer		Germany
Rosina "	38	F				Do
John    "	13	M				Pa
George   "	8	M				Ohio
Catharine "	1	F				O
John Repe	29	M		Baker		Germany
Jacob Zimmermann	34	M		Weaver		Do
Friedrich Bechtold	25	M		Shoemaker		Do
Jacob Kopp	25	M		Baker		Do
Joseph Sacks	21	M		Silversmith		Do
Jacob Cope	22	M		Baker		Do
Friedrich Mertz	25	M		Waggon Maker		Do
Robert Niehaus	20	M		Laborer		Do
William Fell	21	M		Blacksmith		Do
Conrad Messmer	29	M		Rope Maker		Do
Catharine Keller	24	F				Do

Is Jacob KOPP our subject's brother?