— born in Harrison Twp., Pulaski Co., IN, or North Bend Twp., Starke Co., IN:
4.  Henry Allen DUNKLEBARGER, b. 5 Oct 1860/1
5.  William Riley DUNKLEBARGER, b. 1862/3 or 1864/5
6.  Daniel Elijah DUNKLEBARGER, b. 18 Nov 1865/6

— born in North Bend Twp., Starke Co., IN:
7.  John Pierce DUNKLEBARGER, b. 1871/2

A check of the tax rolls should reveal the year William moved from Pulaski Co. to Starke Co. and, thus, where Henry, William, and Daniel were born.

1a.  Jordan R. Dodd, ed.  1998.  Marriage Index: Ohio, 1851-1900.  Liahona Research, Orem, UT (Broderbund CD-236):  not found.

1b.  Allen L. Potts.  Marion County, Ohio, Probate Court Marriage Records, Vols. I-XII, 1824-1902 (online at Heritage Pursuit):  not found.

1c.  Marriage Index:  Indiana, 1851-1900 (Broderbund CD-243):

Dunkelbarger, William

Strndridge (sic), Lucy J.

7 Oct 1880

Starke

2.  1850 Census Index/Images (online at Ancestry.com; Image #12 of 30):  Richland Twp., Marion Co., OH, p. 123A, 783/790, enumerated 4 Sep 1850 (extracted by Diana Gale Matthiesen):  William is unmarried and living with his parents (age 23, b. OH).  He is not the William DUNKELBARGER living in Shawnee Twp., Fountain Co., IN (p. 93, 101/101), who is age 17 and born in PA. 

3a.  1860 Census Index/Images (online at Genealogy.com; Image #1 of 15):  Bruces Lake P.O., Harrison Twp., Pulaski Co., IN, Roll 290 (Book 1), p. 983, PN 41, 288/288, enumerated 4 Jul 1860, official enumeration date 1 Jun 1860 (extracted by Diana Gale Matthiesen):¤•

William Dunklebarger	M	35	W	Farmer	1500	320	Ohio
Mary E. Dunklebarger	F	23	W				"
Sarah M.	F	5	W				Ind
Elizabeth	F	3	W				"
Mary J.	F	1	W				"
Conrad Cupp	M	15	W	Day L			Ohio

Mary Elizabeth (CUPP) DUNKLEBARGER had a brother, Conrad, who was age 15 in 1860, but he is enumerated with his parents Conrad & Sarah Ann (KESTER) CUPP.  Could Conrad have been living back-and-forth between the two households and have accidentally been enumerated twice?  (It happens.) 

3b.  1860 Census Index/Images (online at Genealogy.com; Image #1 of 15):  Bruces Lake P.O., Harrison Twp., Pulaski Co., IN, Roll 290 (Book 1), p. 983, PN 41, 285/285, enumerated 4 Jul 1860, official enumeration date 1 Jun 1860 (extracted by Diana Gale Matthiesen):¤

Christian Dipert	F	55	W	Farming	2500	100	Pa
Samuel	M	18	W	Farm L			Ohio
Elias	M	16	W				"
Julia A. Dunkelbarger	F	12	W				"

Listed three households from our subjects.  It's very hard to figure who Julia is.  William is old enough to be her father, but William was unmarried and living with his parents in the 1850 census.  There is no other DUNKELBARGER family in the county.

3c.  Census Records:  Indiana, 1860 (Broderbund CD-304):

Indianapolis P.O., Centre Twp.-North Half, Marion Co., IN, p. 772, 301/241.
27A	Stanridge, W.J.	M	30	W	Speculator	$1000	$500	Indiana
28A	Stanridge, Lucy	F	29	W		$0	$0	Kentucky
29A	Ford, Fletcher	M	30	W	Laborer	$0	$0	Indiana

It is highly likely that, at age 50, the "Lucy J. STANRIDGE" who married William DUNKLEBARGER in 1880 was a widow.  I have no proof that this is the same woman, but she is the right age, was born in the right place, has the right name, and is in the right state.

4.  1870 Census Index/Images (online at Genealogy.com, Image #2 of 14):  San Pierre P.O., North Bend Twp., Starke Co., IN, Roll 359 (Book 1), p. 18B, PN 2, 13/14, enumerated 18 Jul 1870, official enumeration date 1 Jun 1870 (extracted by Diana Gale Matthiesen):¤•

Dunklebarger William	45	M	W	Farmer	2000	415	Ohio
____________ Mary	35	F	W	Keeping House			Ohio
____________ Sarah	15	F	W				Ind
____________ Elizabeth	13	F	W				Ind
____________ Nancy Jane	11	F	W				Ind
____________ Henry A	9	M	W				Ind
____________ William R	7	M	W				Ind
____________ Daniel E	4	M	W				Ind

Listed next to Mary's parents, Conrad & Sarah (KESTER) CUPP. 

53.  1880 Census Images (online at Ancestry.com, Image #18 of 20):  North Bend Twp., Starke Co., IN, Roll 310 (Book 1), p. 457B, PN 18, SD 5, ED 176, enumerated 19 Jun 1880, official enumeration date 1 Jun 1880 (extracted by Diana Gale Matthiesen):¤•

1880:  for an explanation of the column headings, please see What the Numbers in the Federal Census Mean (missing columns contained no data).

1

2

3

4

5

6

8

9

10

13

21

24

25

26

165

166

Dunklebarger William

W

M

54

/

Farmer

OH

Unk

PA

____________ Nancy

W

F

21

Dau

/

without occupation

IN

OH

OH

____________ Riley

W

M

15

Son

/

at home

/

IN

OH

OH

____________ Daniel

W

M

12

Son

/

at home

/

IN

OH

OH

____________ Pierce

W

M

8

Son

/

/

IN

OH

OH

Living next to the parents of William's late wife.

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

7.  1900 Census Images (online at Ancestry.com; Image #19 of 26):  North Bend Twp., Starke Co., IN, p. 257B, SN 9, SD 13, ED 140, enumerated 13/14 Jun 1900, official enumeration date 1 Jun 1900 (extracted by Diana Gale Matthiesen):¤•

1900:  for an explanation of the column headings, please see What the Numbers in the Federal Census Mean (missing columns contained no data).
1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	19	20	22	23	24	25	26	27	28
180	180	Dunklebarger William	Head	W	M	Mar 1825	75	M	19			OH	PA	PA	Farmer	0	Y	Y	Y	O	F	F	129
		____________ Lucy J	Wife	W	F	Aug 1830	69	M	19	0	0	KY	VA	KY			Y	Y	Y

Living next to George CUPP, who is next to his father, Conrad CUPP, who is the brother of William's first wife, Mary Elizabeth CUPP.

8.  The Gene Pool (online at Ancestry.com).  I've inserted a column (colored yellow) giving the birthyear from the censuses.

Name	Birth Date	Birth Year	Birth Place	Father	Mother
Sarah Marie Dunkleberger	1851	1854/5	North Bend Twp, Starke Co, IN	William Dunkelbarger	Mary E Cupp
Elizabeth Ann Dunkleberger	1853	1856/7	North Bend Twp, Starke Co, IN	William Dunkelbarger	Mary E Cupp
Nancy Jane Dunkleberger	1855	1858/9	North Bend Twp, Starke Co, IN	William Dunkelbarger	Mary E Cupp
Henry Allen Dunkleberger	1857	1860/1	North Bend Twp, Starke Co, IN	William Dunkelbarger	Mary E Cupp
William Riley Dunkleberger	1859	1862/3 or 1864/5	North Bend Twp, Starke Co, IN	William Dunkelbarger	Mary E Cupp
John Pierce Dunkleberger	1863	1871/2	North Bend Twp, Starke Co, IN	William Dunkelbarger	Mary E Cupp
Elizabeth Dunkelbarger	1868	-	North Bend Twp, Starke Co, IN	William Dunkelbarger	Mary E Cupp

I wish people wouldn't guess at birthdates.  Bad data are not better than no data!  I've seen no evidence for a second Elizabeth.

9.  Messages in the Cupp Family Genealogy Forum (online at GenForum.com).

10.  LDS.  Family Search: Internet Genealogy Service:  AF - Ancestral File (online at FamilySearch.org).