— born in Florence Twp., Benton Co., IA:
5.  Luella CORBIN, b. 1878/9

1.  Jordan R. Dodd, ed.  1998.  Marriage Index: Ohio, 1851-1900.  Liahona Research, Orem, UT (Broderbund CD-236):  not found, but there are no Knox County records on this CD.

2.  1860 Census Images (online at Ancestry.com; Image #8 of 24):  Bladensburg P.O., Jackson Twp., Knox Co., OH, p. B, PN 54, 422/413, enumerated 21 Jun 1860, official enumeration date 1 Jun 1860 (extracted by Diana Gale Matthiesen):

Jerome Carbin	31	M		Farmer	1500	300	Md
Caroline  "	19	F					"
Ada?      "	4	F					"
William   "	2	M					"
Jerome    "	1	M					"

Caroline was born in NJ and the rest were born in OH.

3.  1870 Census Images (online at Ancestry.com; Image #166 of 593):  Blairstown P.O., Florence Twp., Benton Co., IA, p. 83B, PN 2, 9/10, enumerated 29 Jul 1870, official enumeration date 1 Jun 1870 (extracted by Diana Gale Matthiesen):

Corbin Jerome	41	M	W	Farmer	5000	900	Ohio
______ Caroline	38	F	W	Keeping House			NJ
______ Adolade	14	F	W				Ohio
______ William	12	M	W				"
______ Jerome	10	M	W				"
______ Catharine	7	F	W				"
Hall Sam L	21	M	W	Farm Laborer			"

4.  1880 United States Census and National Index (LDS Family History Resource File: CD-ROM Library):

Census Place: Florence, Benton, Iowa
Source: FHL Film 1254326; NARA Film T9-0326; Pg 171A
	Relation	Sex	Marr	Race	Age	Birthplace	Occupation	Fa	Mo
Jerome CORBIN	Self	M	M	W	51	OHIO	Farmer	PA	PA
Caroline CORBIN	Wife	F	M	W	42	NJ	Keeps House	NJ	NJ
Addie CORBIN	Dau	F	S	W	24	OHIO	Teaching School	OHIO	NJ
William CORBIN	Son	M	S	W	22	OHIO	At Home	OHIO	NJ
Jerome CORBIN	Son	M	S	W	20	OHIO	At Home	OHIO	NJ
Catharine CORBIN	Dau	F	S	W	17	OHIO	At Home	OHIO	NJ
Luella CORBIN	Dau	F	S	W	1	IOWA		OHIO	NJ
Christopher HERTEL	Other	M	S	W	23	PRUS	Servant	PRUS	PRUS

That's an amazing gap between children.  Jerome's father was born in MD.