1.  Marriage Record:

2.  1880 Census (indexed at FamilySearch.org; page image online at Ancestry.com, Image #50 of 67):  Braddock, Allegheny Co., PA, Roll T9-1088 (Book 1), p. 216B, PN 50, SD 9, ED 33, enumerated 16 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	10	12	13	24	25	26
431	437	Stroup James	W	M	22		/	/	works in Steel Mill	Pa	Pa	Pa
		______ Mary	W	F	22	Wife	/	/	Keeping House	Pa	Pa	Pa

The tick in Column 12 means they were married within the census year.

3.  1890 Census:  the 1890 Census Population Schedules were destroyed.

4.  1900 Census Index/Images (online at Genealogy.com, Image #22 of 47):  422 Camp Avenue, Braddock, Allegheny Co., PA, Roll 1366 (Book 1), p. 191A, SN 2, SD 18, ED 351, enumerated 1 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

21

22

23

24

25

26

27

*

422

19

21

Stroupe James

Head

W

M

Jun 1856

43

M

23

PA

PA

PA

Steele Blower

0

Y

Y

Y

O

M

H

_______ Mary

Wife

W

F

Apr 1856

44

M

23

6

5

PA

PA

PA

Y

Y

Y

_______ Ella

Dau

W

F

Sep 1880

19

S

PA

PA

PA

Book Keeper

Y

Y

Y

_______ George

Son

W

M

Oct 1883

17

S

PA

PA

PA

At School

9

Y

Y

Y

_______ Bessie

Dau

W

F

Feb 1885

15

S

PA

PA

PA

At School

9

Y

Y

Y

_______ Mamie

Dau

W

F

May 1887

13

S

PA

PA

PA

At School

9

Y

Y

Y

_______ Gale

Son

W

M

Aug 1894

5

S

PA

PA

PA

*Camp Avenue

Have they lost track of when they were married?

5.  1910 Census Index/Images (online at Genealogy.com, Image #19 of 70):  422 Camp Avenue, Braddock Borough (Ward 4), Allegheny Co., PA, Roll 1293 (Book 1), p. 178A, SN 10A, SD 23, ED 27, enumerated 21 Apr 1910, official enumeration date 15 Apr 1910 (extracted by Diana Gale Matthiesen):¤•

1910:  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

17

18

19

20

21

22

23

24

25

26

27

28

*

422

160

188

Stroup James

Head

M

W

50

M1

32

PA

PA

PA

Eng

Laborer

Steel Works

W

N

5

Y

Y

O

M

H

______ Mary

Wife

F

W

50

M1

32

6

5

PA

PA

PA

Eng

None

Y

Y

______ Ella

Dau

F

W

28

S

PA

PA

PA

Eng

Stenographer

Real Estate

W

N

0

Y

Y

______ Bessie

Dau

F

W

24

S

PA

PA

PA

Eng

Teacher

Public Schools

W

N

0

Y

Y

______ George

Son

M

W

26

S

PA

PA

PA

Eng

Clerk

Bank

W

N

0

Y

Y

______ Mayme

Dau

F

W

22

S

PA

PA

PA

Eng

Teacher

Public Schools

W

N

0

Y

Y

______ Gale

Son

M

W

15

S

PA

PA

PA

Eng

None

Y

Y

Y

Carvey Elizabeth

Sister in law

F

W

53

S

PA

PA

PA

Eng

None

Y

Y

*Camp Avenue

Mary and Elizabeth have each shaved three years off their age.

6.  1920

7.  1930

8.  Messages posted to the STROUP Surname Board (online at Ancestry.com).