NOTE:  Elizabeth and Sarah could be two different women.

1.  Marriage Record:

2.  1850 Census Index/Images (online at Ancestry.com; Image #22 of 58):  Allegheny Twp., Blair Co., PA, Roll 755, p. 242A, 58/63, enumerated 23 Oct 1850, official enumeration date 1 Jun 1850 (extracted by Diana Gale Matthiesen):¤•

Robert Stroup	26	M	Laborer		Pa
Elizabeth  "	19	F			"
Asberry    "	8/12	M			"
Sarah E. Allbaugh	8	F			"

3.  1860 Census Images (online at Ancestry.com; Image #497 of 712):  Taylor Twp., Blair Co., PA, Roll 1078, p. 497, PN 42, 284/284, enumerated 12 Jun 1860 (extracted by Diana Gale Matthiesen):¤•

Robert Stroup	35	M		Farmer		100	Penna
Elizabeth "	26	F					"
Asbury    "	10	M					"
George    "	6	M					"
Ellen     "	4	F					"
William   "	1	M					"

4.  1870 Census Index/Images (online at Genealogy.com, Image #31 of 36):  Martinsburg P.O., Taylor Twp., Blair Co., PA, Roll 1310 (Book 1), p. 453A, PN 31, 204/204, enumerated 6 Jul 1870, official enumeration date 1 Jun 1870 (extracted by Diana Gale Matthiesen):¤•

Stroup Robert	43	M	W	Farmer	6840	800	Pennsylvania
______ Sarah	37	F	W	Keeping House			Penna
Eatleblah? John	86	M	W	Retired Farmer			Born on board Vessel
Stroup George	16	M	W				Penna
______ Ellen	13	F	W				Penna
______ John	9	M	W				Penna
______ Robert	1	M	W				Penna

There's a strong probability that John EATLEBLAH(?) is Sarah's father.

5.  1880 Census (indexed at FamilySearch.org; page image online at Ancestry.com, Image #19 of 42):  Sharpsburg, Taylor Twp., Blair Co., PA, Roll 1103, p. 524C, PN 19, SD 8, ED 178, enumerated 11 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

7

8

9

11

13

21

24

25

26

150

165

Stroup Robert

W

M

52

/

Laborer

PA

PA

PA

______ John

W

M

17

Son

/

Works at Furnace

PA

PA

PA

Foster Ellen

W

F

23

Dau

/

PA

PA

PA

______ Wilbert

W

M

9/12

Sept

Grand Child

/

PA

PA

PA

Stroup Mary

W

F

9

Dau

/

/

PA

PA

PA

Stroup Robert

W

M

11

Son

/

Farm Laborer

/

PA

PA

PA

______ Annie

W

F

16

Dau

/

PA

PA

PA

Listed next to son, George M. STROUP. 

6.  1890 Census:  the 1890 Census Population Schedules were destroyed.

7.  1900 Census Index/Images (online at Genealogy.com):  not found, at least not indexed as Robert Stroup in Pennsylvania.