1.  LDS.  Family Search: Internet Genealogy Service:  IGI - International Genealogical Index (online at FamilySearch.org).

Marion STROPE Spouse: Missouri CUTRIGHT Marriage: 17 Nov 1870, Fayette, Ohio Source: Marriage Records, 1810-1909. Ohio. Probate Court (Fayette County)

2.  1880 Census (indexed at FamilySearch.org; page image online at Ancestry.com, Image #13-14 of 20 — indexed as "Manor" and "Misson"):  Marion Twp., Fayette Co., OH, pp. 553A-553B, PN 13-14, SD 5, ED 55, enumerated 21 Jun 1880, official enumeration date 1 Jun 1880 (extracted by Diana Gale Matthiesen).  This enumerator did not use dwelling and family numbers, so you just have to guess where one household ends and the next begins.¤•

1880:  for an explanation of the column headings, please see What the Numbers in the Federal Census Mean (missing columns contained no data).
3	4	5	6	8	9	10	13	21	24	25	26
Strope Marion	W	M	33	Husband		/	Farmer		O	Md	O
______ Missori	W	F	27	Wife		/	House Keeper		O	O	O
______ Henry	W	M	8	Son				/	O
______ Cory	W	F	2	Dau					O
Powell Gorge	W	M	17	Apprentice	/		Farm Hand	/	O	O	O

Marion's father was born in Ohio, not Maryland.  George POWELL also shows up as a farm hand in the household of Marion's father, William STROPE.

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

4.  R.S. Dill.  1881.  History of Fayette County, together with Historic Notes on the Northwest and the State of Ohio.  Odell & Mayer, Publ., Dayton, OH (online at Genealogy.com; Borderbund CD-450):

p. 910

MARION TOWNSHIP... MARION STROPE. Marion Strope, farmer, son of William Strope, whose biography appears in another part of this work, was born March 6, 1847, in this township, and in the house he now occupies.  November 17, 1871, he was married to Missouri Cartright, who has borne him two children: Henry Veal and Cora Ellen, both living.  Mrs. Strope in an exemplary member of the Methodist Episcopal Church, of New Holland.  He is a member of New Holland Lodge No. 392, F. & A. M., and at present holds the office of Junior Warden.  During the rebellion he went with Company I, 150th O.N.G., and with the regiment was stationed at various points; served as a private.  He is a Republican.  Is serving the third successive term as trustee of this township.