1.  Marriage Record:

2.  1850 Census Index/Images (online at Ancestry.com; Image #2 of 28):  Aleppo Twp., Greene Co., PA, p. 339B, 9/9, enumerated 11 Oct 1850, official enumeration date 1 Jun 1850 (extracted by Diana Gale Matthiesen):¤•

Thomas Strope	24	M		Farmer	250	Pa
Eliza     "	30	F				"

Listed three households from John MITCHELL (æ 62, b. PA) and his wife, Jane (æ 50, b. PA), who are probably Eliza's parents.

3.  1860 Census Indes/Images (online at Genealogy.com; Image #28 of 29):  New Freeport P.O., Springfield [Springhill] Twp., Greene Co., PA, Roll 1114 (Book 1), p. 776, PN 28, 200/195, enumerated 4 Sep 1860, official enumeration date 1 Jun 1860 (extracted by Diana Gale Matthiesen):¤•

Thomas Strope	36	M		Farmer	800	300	Penna
Eliza    "	45	F					"
Geo      "	8	M					"
Hagan Miller	6/12	M					"
James Lyons	22	M		Day Laborer			Penna

Who is Hagan?

4.  1870 Census Index/Images (online at Genealogy.com, Image #33 of 38):  Rogersville P.O., Springhill Twp., Greene Co., PA, Roll 1348 (Book 1), p. 424A, PN 33, 237/237, enumerated 19 Jul 1870, official enumeration date 1 Jun 1870 (extracted by Diana Gale Matthiesen):¤•

Thomas Strope	45	M	W	Farmer	3500	700	Penna
Eliza	50	F	W	Keeping house			"
Sarah Strope	78	F	W				"

Sarah is Thomas's mother.

5.  1880 Census Images (online at Ancestry.com, Image #18 of 35):  Springhill Twp., Greene Co., PA, p. 366B, PN 18, SD 8, ED 83, 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	22	23	24	25	26
161	164	Strope Thomas	W	M	55			/	Farmer	/	/	PA	PA	PA
		______ Sarah	W	F	40	Wife		/	Keeping House			PA	PA	PA
		______ Park	W	M	3	Son	/		At Home			PA	PA	PA

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

7.  1900 Census Index/Images (online at Genealogy.com, Image #14-15 of 37; online at Ancestry.com, Image #16-17 of 23):  Springhill Twp., Greene Co., PA, Roll 1414 (Book 1), pp. 222B-223A, SN 7-8, SD 17, ED 100, enumerated 15 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	28
125	125	Strope Thomas	Head	W	M	Nov 1824	75	Wd				PA	PA	PA	Farmer	12		Y	N	Y	O	F	F	67
		______ Lloyd	Son	W	M	Jun 1876	23	M	4			PA	PA	PA	Farmer	0		Y	Y	Y
		______ Purman	Son	W	M	Jun 1881	18	S				PA	PA	PA	Farm Laborer	4	0	Y	Y	Y
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		Strope Mary E	Daughter-in-law	W	F	Aug 1871	28	M	4	0	0	PA	PA	PA				Y	Y	Y

This record was extremely difficult to read, so I may not have got it entirely correct.

8.  Samuel P. Bates.  1888.  History of Greene County, Pennsylvania.  Nelson, Rishforth & Co., Chicago (online at Genealogy.com).  On p. 858:

THOMAS STROPE, farmer and stock-grower, Deep Valley, Penn., was born November 22, 1823, and is a son of Thomas and Sarah (Elems) Stope (sic).  His parents were of English descent.  His father, who was a farmer during his lifetime, died in 1848.  Mr. Thomas Thrope (sic) is a fourth in his father's family and the eldest who grew to maturity.  His opportunities for an education were very limited.  He is a self-made man and now owns 290 acres of well improved land.  When he was a small boy, he worked by the month and then worked on a farm as a tenant.  He also learned the tanner's trade, at which he was employed until twenty-four years of age.  Mr. Strope's first wife was Eliza Mitchell, who lived twenty-five years after their marriage.  They had one child, George W.  Mrs. Sarah Jane Strope, the present wife, was the daughter [of] Jacob Miller, a prominent farmer of Springhill Township.  Mr. and Mrs. Strope are the parents of two children -- Park L. and Purman D.  Mr. Strope is a Republican.  He is a member of the Masonic Fraternity and the Patrons of Husbandry.  He and wife are members of the Church of God.

In the 1900 census, Thomas gives his birthdate as Nov 1824, which is more in line with other censuses as well.  Sarah may have been English, but Thomas was German.  Thomas was not the fourth child of his father; he was the fourth of his father's surviving children.  He was the first and eldest of the four children of Sarah (ALLUM) STROPE, his father's second wife.  His father had a prior wife and at least seven prior children.

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