1.  LDS.  Family Search: Internet Genealogy Service:  IGI - International Genealogical Index (online at FamilySearch.org).

Daniel OBORN Birth: 30 Jun 1794, Huntington Co., , , Ohio Death: 23 Jul 1875 Spouse: Mary Oborn Birth: 30 Sep 1863, Muskington, , Marion, Ohio Death: 30 Sep 1863 Source: patron submission

There are so many serious mistakes in this record that one is inclined to dismiss the whole thing, but some of it does seem reasonable.  The problems are:  Huntingdon Co., is in PA, not OH; Mary was obviously not born the day she died; there is no such place as "Muskington" though there is a Muskingum Co. (formed in 1804), but it did not exist when Mary was born and neither did Marion Co. (formed in 1820), besides which, Mary was born in PA, not OH; Mary may have been surnamed OBORN, but it's much more likely she was not.  Positives:  Daniel's birthdate and a Huntington Co., PA, birthplace jibe with the census, as do the deathdates.

2.  1830 Census Index/Images (online at Ancestry.com):  not found, nor do I find any OBORN/OBERN/OBOURN anywhere, but there is a Joseph OBURN (001101-11101-00) in Barree Twp., Huntingdon Co., PA (p. 59).

3.  1830 Census Index/Images (online at Ancestry.com, Image #11 of 12 — mis-indexed as being in "Morven" (there's no such place, so this is probabl a mis-reading of "Marion," but in any case, that's not where he was); extracted by Diana Gale Matthiesen):

1830

OH

Marion Co.

Richland Twp.

Roll M19-135

p. 163A

Ln. 6

Daniel Obourn

000 001 - 300 001

These data indicate:

No. & Sex	Age Class	Therefore Born	Individuals Inferred
1 male	30-39	1790-1800	= Daniel (b. 1794)
3 females	4 or under	1825-1830	= Mary (b. 1829) = Margaret (b. 1828) = Catharine (b. 1827)
1 female	30-39	1790-1800	= Margaret (b. 1796)

4.  1840 Census Index/Images (online at Ancestry.com, Image #11-12 of 14; extracted by Diana Gale Matthiesen):¤-

1840

Ohio

Marion Co.

Richland Twp.

Roll 411

pp. 72B-73A

Ln. 10

Daniel Oborn

120 000 100 - 003 000 100

0100000

These data indicate:

No. & Sex	Age Class	Therefore Born	Individuals Inferred
1 male	4 or under	1835-1840	= Joseph (b. 1835/6)
2 males	5-9	1830-1835	= William (b. 1831) = Daniel Jr. (b. 1831)
1 male	40-49	1790-1800	= Daniel (b. 1794)
3 females	10-14	1825-1830	= Mary (b. 1829) = Margaret (b. 1828) = Catharine (b. 1827)
1 female	40-49	1790-1800	= Mary (b. 1797/8)
1	person employed in agriculture

Listed five lines from Joseph OBORN (æ 30-40).

5.  1850 Census Index/Images (online at Ancestry.com; Image #1 of 30 — mis-indexed "Obever"):  Richland Twp., Marion Co., OH, p. 117B/234, 699/706, enumerated 21 Aug 1850, official enumeration date 1 Jun 1850 (extracted by Diana Gale Matthiesen):

Daniel Obern	56	M		Farmer	12000	Pa
Mary      "	52	F				"
Catharine "	23	F				O
Margaret  "	22	F				O
Mary      "	21	F				O
Daniel    "	19	M		Labourer		O
William   "	19	M		"		O
Joseph    "	14	M				O

The enumerator noted that Daniel and William were "twins."

6.  1860 Census Index/Images (online at Genealogy.com, Image #19 of 36):  Marion P.O., Richland Twp., Marion Co., OH, Roll 1006 (Book 1), p. 391A, PN 57, 413/402, enumerated 23 Jun 1860, official enumeration date 1 Jun 1860 (extracted by Diana Gale Matthiesen):

Daniel Oborn	66	M		Farmer	16,000	2,000	Penn
Mary      "	61	F					Do
Catharine "	30	F					Ohio
Elizabeth Boothe	25	F		Domestic			Do

Catharine has shaved a few years off her age.

7.  1870 Census Index/Images (online at Genealogy.com, Image #26 of 28):  Waldo P.O., Richland Twp., Marion Co., OH, Roll 1240 (Book 1), p. 176B, PN 28, 211/216, enumerated 22 Jul 1870, official enumeration date 1 Jun 1870 (extracted by Diana Gale Matthiesen):

Obern Daniel	77	M	W	Farmer ret	25020	9000	Pennsylvania
_____ Catharine	40	F	W	Keeping House			Ohio

8.  1880 Census Every-Name-Index/Images (online at Ancestry.com):  not found.

9.  U.S. Dept. of the Interior, Bureau of Land Management. The Official Land Patent Records Office.

Date	Cert. No.	Land Office	Patented By	Acres	Aliquot Section.Township.Range	Meridian	State	County*
10 Dec 1821	251	Delaware	Daniel Oborn of the State of Ohio	160	NE¼ S2.T1S.R14E	1st PM	OH	Wyandot
10 Dec 1821	252	Delaware	Daniel Oborn of the State of Ohio	95.22	E½ NW¼ S19.T6S.R16E	1st PM	OH	Marion
10 Dec 1821	253	Delaware	Daniel Oborn of the State of Ohio	94.72	E½ SW¼ S19.T6S.R16E	1st PM	OH	Marion
*The county is not given on the original certificate, which describes the location of the land solely in terms of Aliquot, Section, Township, and Range.  The county names must have been added to the database at some later time, probably when the certificate data were computerized.

10.  J. Wilbur Jacoby.  1907.  History of Marion County, Ohio, and Representative Citizens.  Biographical Publ. Co., Chicago, IL (Broderbund CD-450; also online at Heritage Pursuit):

p. 119

Joseph Oborn also built a cabin near King's Mills but did not bring his family until the following year [1821], when his brother Daniel also came...

11.  Anon.  Thursday, 16 May 1946.  "Kin of Marion Pioneer Writes Article On Divorce Problem."  The Marion Star (Marion, Ohio), v. ?, n. 143, p. 14 (online at Ancestry.com):

The May 9 issue of "The Christian Advocate," a Methodist church magazine, contains an article on the divorce problem by  [Rev. J. Wesley Oborn,] a descendent of Daniel Oborn, an early settler of Marion county and a founder of the First Presbyterian church here...

The rest of the article is about divorce.  I quote the opening sentence because it tells us our subject founded the First Presbyterian Church in Marion.

12.  Public Member Trees (online at Ancestry.com).