1798 is very early to be in Ohio.

— born in IN, probably Miami Co.:
3.  Lavinia?/Louisa? STROUP, b. 1841/2
4.  Noah STROUP, b. 1842/3

1a.  Marriage Index:  Maryland, 1655-1850.  Liahona Research, Orem, UT (Broderbund CD-224):  there are no STRAUB/STROUB/STRAUP/STROUP marriages, at all, on this CD.

1b.  Anon.  1966.  Marriage Index:  Ohio, 1789-1850.  Liahona Research, Orem, UT (Broderbund CD-400):

Stroup, Michael

Wissinger, Elizabeth

9 Oct 1837

Montgomery Co.

2.  Census Index:  U.S. Selected Counties, 1820 (Broderbund CD-314):  there are no STRAUBs/STROUPs/etc. in Maryland, at all.

3.  Census Index:  U.S. Selected Counties, 1830 (Broderbund CD-315):  there are no STRAUBs/STROUPs/etc. in Maryland, at all.  It is still possible for daughter, Mary, to have been born in MD in 1832 if:  1) Michael immigrated to MD after 1830 and/or 2) Michael married after 1830.

4.  1840 Census Index/Images (online at Ancestry.com):  can't find.  He should be in OH or IN.   The only Michael STROUP in Ohio is the one in Highland County who is married to Margaret WALKER — and they are still there in the 1850 census, so there is no doubt who that Michael is. 

5.  1850 Census Index/Images (online at Ancestry.com; Image #17 of 26):  Washington Twp., Miami Co., IN, p. 168A, 1234/1261, enumerated 1-3 Oct 1850, official enumeration date 1 Jun 1850 (extracted by Diana Gale Matthiesen):

Isaac Wissenger	35	M		Far	1200	O
Aaron	18	M		"		I
Eliza Stroup	51	F				O
Mary	17	F				Md
Moses	10	M				O
Lavina?	8	F				I
Noah	7	M				"

Mary is Michael's daughter by his first wife.  Moses, Lavina, and Noah are Michael's children with Eliza.  Isaac is 25, not 35; Aaron is said to be his brother, but if so, he should have been born in Ohio.  Eliza STROUP is Isaac's twice-married, twice-widowed mother.  By the end of the year, Isaac WISSINGER marries his step-sister, Mary STROUP.

6.  1860 Census Images (online at Ancestry.com; Image #364 of 436):  Peru P.O., Washington Twp., Miami Co., IN, p. 366, PN 80, 589/565, enumerated 25 Jun 1860, official enumeration date 1 Jun 1860 (extracted by Diana Gale Matthiesen):

Isaac Wissinger	36	M		Farmer	2800	600	Ohio
Mary      "	28	F					Maryland
[Isaac & Mary's children]
Noah Stroup	16	M					Ind
Elizabeth "	61	F					Ohio

7.  LDS.  Family Search: Internet Genealogy Service:  AF - Ancestral File (online at FamilySearch.org).

8.  WorldConnect / Ancestry World Trees (online at RootsWeb.com/Ancestry.com).