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

Hall, Elijah	Miller, Caty	Jan 18, 1821	Knox Co.
Hall, Elijah	Hall, Sally	Jan 30, 1823	Knox Co.
Hall, Elijah	Hanna, Eliza	Jan 10, 1828	Knox Co.

Could any (or all) of these be Elijah's former wife (wives)?  This CD is missing a great many Knox Co. marriages, especially later ones, so the fact that there is no marriage record on the CD between an Elijah HALL and an "Ann" doesn't mean there wasn't such a marriage in Knox Co.

2.  1790

3.  1800

4.  1810

5.  1820

6.  Census Index:  U.S. Selected Counties, 1830 (Broderbund CD-315):

1830

Hall, Elijah

OH

Knox Co.

Jackson Twp.

p. 213

He is the only Elijah HALL in the county.

7.  Census Index:  U.S. Selected Counties, 1840 (Broderbund CD-316):

1840	Hall, Elijah	OH	Knox Co.	Jackson Twp.	p. 403
1840	Hall, Elijah	OH	Knox Co.	Jackson Twp.	p. 404
1840	Hall, Elijah W.	OH	Knox Co.	Jackson Twp.	p. 405

8.  Family Quest Archives:  Ohio Federal Census 1850: Knox County.  Heritage Quest CD M432-700:  Jackson Twp., Knox Co., OH, p. 378AB, 2197/2254, enumerated 16 Sep 1850 (extracted by Diana Gale Matthiesen):

Elijah Hall	83	M	Farmer		Md
Anny    "	50	F			do
Kinney  "	22	M	do		Ohio
James   "	17	M	do		do
Sarah A "	14	F			do
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Almeda Hall	12	F			Ohio

He is the only Elijah HALL in the county.  Listed next to E. C. HALL, who is likely Elijah's son.