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

2.  1830

3.  NARA.  1967.  Population Schedules of the Sixth Census of the United States, 1840, Roll 406, Ohio, Volume 13 (211-412): Knox County.  Microcopy No. 704. National Archives Microfilm Publications, Washington, DC  (Family Quest Archives:  Ohio Federal Census 1840:  Knox County.  Heritage Quest CD M704-406; extracted by Diana Gale Matthiesen).

1840

OH

Knox Co.

Jackson Twp.

p. 399B

Harden? Horn

000 200 100 - 021 100 100

These data indicate:

No. & Sex	Age Class	Therefore Born	Individuals Inferred
2 males	15-19	1820-1825	= Thomas (b. 1825/6) = Son A
1 male	40-49	1790-1800	= Hardman (b. 1789/90)
0 females	4 or under	1835-1840	= Malinda (b. 1838/9)
2 females	5-9	1830-1835	= Arzina (b. 1833/4) = Hetta (b. 1831/2)
1 female	10-14	1825-1830	= Elizabeth (b. 1829/30)
1 female	15-19	1820-1825	= Daughter A
1 female	40-49	1790-1800	= Hannah?

Malinda is missing.  Did the census-taker make a mistake?  As in 1850, Hardman is living near his brother, Martin HORN. 

4.  Family Quest Archives:  Ohio Federal Census 1850: Knox County.  Heritage Quest CD M432-700:  Jackson Twp., Knox Co., OH, p. 377B, 2184/2241, enumerated 16 Sep 1850 (extracted by Diana Gale Matthiesen):

Hardman Horn	60	M	Farmer	7000	Penn
Hannah    "	63	F			Va
Thomas    "	24	M	do		Ohio
Elizabeth "	20	F			do
Hetta     "	18	F			do
Arzina    "	16	F			do
Malinda   "	11	F			do
Fritena   "	7	F			do
Alexander "	5	M			do

It's impossible for Hannah to be 63 and have a child only five.  It's also unlikely that she is older than her husband.  Surely the census-taker has made a mistake.  This record would make much sense if she were 53, not 63, especially as Hardman's wife in the 1840 Census was born 1790-1800.  Either this census-taker has erred or Hannah has recently married Hardman and these are not her children — but I can find no such marriage record.