1.  Marriage Record:

2.  1820

3.  1840

4.  1850

5.  1860 Census Every-Name-Index/Images (online at Ancestry.com, Image #20 of 36):  Marion P.O., Richland Twp., Marion Co., OH, Roll M653_1006, p. 391B, PN 58, 421/410, enumerated 23 Jun 1860, official enumeration date 1 Jun 1860 (extracted by Diana Gale Matthiesen):

Benjamin Waddel	31	M		Farmer	13,000	1,000	Ohio
Jane        "	29	F					Do
George      "	8	M					Do
Joseph      "	4	M					Do
Mary Oborn	71	F					Penn
Tena Newberry	35	F					Ohio

6.  1870 Census Index/Images (online at Genealogy.com, Image #25 of 28):  Waldo P.O., Richland Twp., Marion Co., OH, Roll 1240 (Book 1), p. 176A, PN 27, 208/213,enumerated 22 Jul 1870, official enumeration date 1 Jun 1870 (extracted by Diana Gale Matthiesen):

Obern William	44	M	W	Farmer	10320	6120	Ohio
_____ Mary J	33	F	W	Keeping House			Do
_____ Albert	11	M	W				Do
_____ Benjamin	9	M	W				Do
_____ Elmer	7	M	W				Do
_____ Jane	5	F	W				Do
_____ Ida C	3	F	W				Do
_____ John	8/12	M	W				Do	Oct
_____ Joseph	41	M	W	Farmer	8000	7000	Do
Smith Robert M	28	M	W	Farm Laborer			Do
Obern Mary	81	F	W				Pennsylvania

.  Birthdate calculated using Ben Buckner's Birthdate Calculator.

Name	Deathdate	Age at Death	Result
Joseph OBORN	6 Aug 1850	0d 6m 59y	6 Jul 1791
Mary (SMITH) OBORN	7 Apr 1880	0d 1m 91y	7 Mar 1789
(Calculated birthdates should always be prefaced with "ca." — you can't be certain the person who calculated their age did it correctly.)

 .  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 Sec.Twp.Rng	Meridian	State	County*
-	-	-	-	-	-	-	-	-
-	-	-	-	-	-	-	-	-
-	-	-	-	-	-	-	-	-
*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.

.  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).  Includes mention of our subject, plus a biographical sketch of his grandson, Albert OBORN. 

-	-
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...
p. ?	ALBERT OBORN . . . a grandson of Joseph and Mary (Smith) Oborn. Joseph Oborn and his wife who were born in Pennsylvania, were respectively, of Scotch and Irish descent.  Upon coming to Ohio, they first settled in Perry County, removing later, in 1835, to Richland township, Marion County, where Joseph Oborn entered land — the farm that our subject now owns.  After a short residence here, they returned to Perry County for one year and then came back to Marion County, making the trip in wagons, often finding it necessary to cut their way through the timber.  Joseph Oborn erected a log house, began clearing the land, and with his wife battled with all kinds of hardships to make a living and raise their family.  Upon the discovery of gold in California, he joined the fortune-seekers in their journey to the far West.  His search for the precious metal not proving successful, he started home in the summer by way of the Isthmus of Panama.  He was taken sick while crossing the isthmus, died on the 6th of August, 1850, aged 59 years and 6 months and buried there.  By those who remember him, Joseph Oborn is said to have been a good scholar, with an extensive knowledge of surveying and trigonometry by which he could figure eclipses of the sun and moon.  He excelled in writing and penmanship.  For many years he was school examiner in Richland township: before he would issue a certificate to teacher, the applicant had to satisfy him that he could make a pen out of a quill and write a good, legible hand.  His wife Mary survived him many years, dying April 7, 1880, aged 91 years and one month, and being buried in the Marion Cemetery. William Oborn was born in Perry County, Ohio, and was the eldest of a family of three children in the parental family, the others being Joseph, and Jane, who married Benjamin Waddel. William accompanied his parents to Marion County in childhood and thereafter lived on the homestead in Richland township, which he helped to clear and put under cultivation, enduring, many hardships in the first years of his residence here.  He married Mary Jane Emery...

Land records show Joseph was in Marion County by 1821 and, on a previous page, the author, himself, shows Joseph to have arrived in 1821, not 1835.
 
 

.  Birthdate calculated using Ben Buckner's Birthdate Calculator.

Name	Deathdate	Age at Death	Result
Joseph OBORN	6 Aug 1850	0d 6m 59y	6 Jul 1791
Mary (SMITH) OBORN	7 Apr 1880	0d 1m 91y	7 Mar 1789
(Calculated birthdates should always be prefaced with "ca." — you can't be certain the person who calculated their age did it correctly.)