— born in Jackson Twp., Wayne Co., IN:
3.  Adam JOHNSONBAUGH, b. 1837-39
4.  Henry JOHNSONBAUGH, b. 1840/1
5.  Mary Ann JOHNSONBAUGH, b. 1842/3
6.  David JOHNSONBAUGH, b. 1845/6

1.  Marriage Record:

2.  1830 Census Index and Digital Images (online at Ancestry.com; Image #1 of 20; extracted by Diana Gale Matthiesen):

1830

PA

Centre Co.

Gregg Twp.

p. 356

David Johnsonbaugh

000 010 - 000 010

These data indicate:

No. & Sex	Age Class	Therefore Born	Individuals Inferred
1 male	20-29	1800-1810	= David (b. 1806/7)
1 female	20-29	1800-1810	= Margaret (b. 1805/6)

3.  1840 Census Index and Digital Images (online at Ancestry.com; Image #31-32 of 40; extracted by Diana Gale Matthiesen):

1840

IN

Wayne Co.

Jackson Twp.

p. 318

David Johnsonbaugh

110 001 - 010 001

0100000

These data indicate:

No. & Sex	Age Class	Therefore Born	Individuals Inferred
1 male	4 or under	1835-1840	= Adam (b. 1836/7)
1 male	5-9	1830-1835	= John (b. 1830/1)
1 male	30-39	1800-1810	= David (b. 1806/7)
1 female	5-9	1830-1835	= Mary Ann (b. 1833/4)
1 female	30-39	1800-1810	= Margaret (b. 1805/6)
1	person engaged in agriculture

Listed one line below David's brother, Henry JOHNSONBAUGH, who is listed three lines below their brother, John JOHNSONBAUGH. 

4.  Census Microfilm Records:  Indiana, 1850 (Broderbund CD-302):  Jackson Twp., Wayne Co., IN, p. 38B, 558/558, enumerated 19 Sep 1850 (extracted by Diana Gale Matthiesen):

David Johnsonbaugh	43	M	Farmer	1600	Pennsylvania
Margaret Johnsonbaugh	44	F			"
John Johnsonbaugh	19	M			"
Mary Ann Johnsonbaugh	17	F			Indiana
Adam Johnsonbaugh	13	M			"
Henry Johnsonbaugh	9	M			"
Mary Ann Johnsonbaugh	7	F			"
David Johnsonbaugh	4	M			"

The elder Mary Ann must be John's wife (see next source).

5.  Census Records, Indiana, 1860 (Broderbund CD-304):  Cambridge City P.O., Jackson Twp., Wayne Co., IN, p. 153, 83/83:

01A	Jonsonbaugh, David	M	53	W	Farmer	$5000	$400	Pennsylvania
02A	Jonsonbaugh, Margaret	F	54	W				Pennsylvania
03A	Jonsonbaugh, Henry	M	20	W	Farm Laborer			Indiana
04A	Jonsonbaugh, David	M	14	W				Indiana
05A	Jonsonbaugh, Adam	M	22	W	Farm Laborer	$0	$0	Indiana
06A	Jonsonbaugh, Maryann	F	27	W	Widow			Indiana
07A	Jonsonbaugh, Levi	M	5	W				Indiana
08A	Jonsonbaugh, Harriet	F	1	W				Indiana
09A	Jonsonbaugh, Elizabeth	F	6	W				Indiana

Levi and Harriet would appear to be the children of Widow Maryann.  Elizabeth may be the child of George JOHNSONBAUGH, whose mother died at her birth in 1852.  She should be 7 or 8, not 6, but such errors in censuses are typical.  Otherwise, I have not been able to find Elizabeth because she is not living with her father and his second wife. 

6.  1870 Census Every-Name-Index/Images (online at Ancestry.com, Image #36 of 50):  Argos P.O., Walnut Twp., Marshall Co., IN, Roll M593_342, p. 234B, PN 36, 296/291, enumerated 25 Jun 1870, official enumeration date 1 Jun 1870 (extracted by Diana Gale Matthiesen):

Johnsonbaugh David	24	M	W	Farmer	2500	300	Indiana
____________ Margrett	64	F	W	Keeping house			Pennsylvania
____________ Mary	36	F	W				Indiana
____________ Harriett	11	F	W				Indiana
Gortman George	22	M	W	Day Laborer		1700	Ohio

7.  1880 United States Census and National Index (LDS Family History Resource File: CD-ROM Library):

Census Place: Jefferson, Wayne, Indiana
Source: FHL Film 1254321; NARA Film T9-0321; Pg 80A
	Relation	Sex	Marr	Race	Age	Birthplace	Occupation	Fa	Mo
Henry JOHNSONBAUGH	Self	M	M	W	38	IN	Farmer	PA	PA
Susan JOHNSONBAUGH	Wife	F	M	W	35	IN	Keeping House	PA	PA
Harrison JOHNSONBAUGH	Son	M	S	W	15	IN	Works On Farm	IN	IN
Charles JOHNSONBAUGH	Son	M	S	W	13	IN	Works On Farm	IN	IN
Dora JOHNSONBAUGH	Dau	F	S	W	11	IN	At Home	IN	IN
Ida JOHNSONBAUGH	Dau	F	S	W	9	IN		IN	IN
Elizabeth JOHNSONBAUGH	Dau	F	S	W	2	IN		IN	IN
Margaret JOHNSONBAUGH	Mother	F	W	W	69	PA		PA	PA