1a.  Anon.  1966.  Marriage Index:  Ohio, 1789-1850.  Liahona Research, Orem, UT (Broderbund CD-400):

Montgomery, ???

Chase, Mary

12 Nov 1842

Hancock Co.

1b.  Jordan R. Dodd, ed.  1998.  Marriage Index: Ohio, 1851-1900.  Liahona Research, Orem, UT (Broderbund CD-236):

Montgomery, George

Culp, Dorothy A.

7 Dec 1862

Hancock Co.

2.  1850 Census Index/Images (online at Ancestry.com; Image #298 of 427):  Portage Twp., Dist. No. 48, Hancock Co., OH, p. 40A, 9/9, enumerated 23 Jul 1850, official enumeration date 1 Jun 1850 (extracted by Diana Gale Matthiesen):

George Montgomery	29	M		Farmer	1000	Ohio
Mary	23	F				New York
Miles	6	M				Ohio
Elizabeth	4	F				Ohio
Benona	1	M				Ohio
John Robbins	21	M		Laborer		Ohio

3.  1860

4.  1870 Census Images (online at Ancestry.com; Image #13 of 23):  Findlay P.O., Portage Twp., Hancock Co., OH, p. 254A, PN 13, 95/95, enumerated 20 Jun 1870, official enumeration date 1 Jun 1870 (extracted by Diana Gale Matthiesen):

George Montgomery	47	M	W	Farmer	6500	1200	Penn
"     Dortha	31	F	W	Keeping House			Ohio
"     Franklin B	21	M	W	Farm laborer			"
"     Elizabeth J	22	F	W				"
"     Malisa	19	F	W				"
"     Susan	14	F	W				"
"     Mary S	12	F	W				"
"     Martha S	12	F	W				"
"     David	16	M	W	Farm laborer			"
"     George C	9	M	W				"
"     Angeline	6	F	W				"
"     Rachel	5	F	W				"

Listed four households from George & Mary's eldest child, Miles MONTGOMERY (æ 25).

5.  1880

6.  1890 Census:  the 1890 census population schedules were destroyed.

7.  1900

8.  1910

9.  Anon.  1886.  History of Hancock County, Ohio.  Warner, Beers, & Co., Chicago (online at Heritage Pursuit):

p. 851

PORTAGE TOWNSHIP... GEORGE MONTGOMERY, farmer and stock raiser, P.O. Portage Center, was born in Wayne County, Ohio, October 11, 1823, only child of John and Nancy (Helmick) Montgomery, natives of Ohio, former of whom was killed by the falling of a tree when our subject was one year old.   On the death of his father little George was sent to live with his grandparents.  His maternal grandfather, Nicholas Helmick, was a soldier in the war of 1812.  He was a very large man and very determined in his ways.  He came to this county in 1832 and settled in Cass Township, where George was reared and grew to maturity.  Living in a newly-settled country, our subject's means for obtaining an education were limited, attending school only three months in his life.  He lived with his grandfather until twenty-one years of age; he then bought a tax title to forty acres of wild timbered land in Portage Township, this county.  He was without capital, and, to get a start in life, took up auctioneering in connection with farming, a business he followed with success for thirty-seven years.  For many years, Mr. Montgomery was one of the best known auctioneers in this county and the only one in that line who took out a license for the full year.  He has, however, made farming his principal business and, at one time, was the owner of 1400 acres of land; but, since his children married, he has helped them to a start in life, and he now owns only the homestead farm, consisting of 105 acres.  Mr. Montgomery was united in marriage, in 1844, with Mary, daughter of George Chase, a pioneer of this county.  To this union were horn nine children:  Miles W., Benoni K., Elizabeth Jane, Elcie M., David, Irene, Martha S. and Mary S. (twins), and George C.  The mother died in 1861, and our subject married, for his second wife, Doratha A., daughter of Benoni Culp, and to this union have been born three children:  Angie, Rachel, and Wellington H.  In politics, Mr. Montgomery is a Republican.  He has been postmaster of Portage Center, the second post office established in this county, the office being now located in his residence.