1.  Marriage Record:

2.  1810 Census Index/Images (online at Ancestry.com):  not found as head-of-household, but John appears to be living with his parents.

3.  1820 Census Index/Images (online at Ancestry.com; Image #4 of 4; extracted by Diana Gale Matthiesen):¤•

1820

PA

Venango Co.

Richland Twp.

Roll M33_114

p. 14A

Ln. 13

John Stroup

001210-00101-0-300

These data indicate:

No. & Sex	Age Class	Therefore Born	Individuals Inferred
1 male	16-18	1801-1804	= ?
2 males	19-25*	1794-1801	= ? = ?
1 male	26-44	1775-1794	= John
1 female	16-25	1794-1804	= Nancy
1 female	45 or over	in or bef. 1775	= Eva (b. 1760-65)
3	persons engaged in agriculture
*In the 1820 Census, the third column is age class 16-18 and the fourth column is age class 16-25; therefore, any individual in column three is duplicated in column four.  By subtracting the number in column three from the number in column four, you can create an age class "19-25."

John's mother is a widow, and she appears to be living with him.

4.  1830 Census Index/Images (online at Ancestry.com; Image #9 of 10; extracted by Diana Gale Matthiesen):¤•

1830

PA

Venango Co.

Rockland Twp.

Roll M19_164

p. 62

Ln. 6

Stroup John

100 001 - 000 101

These data indicate:

No. & Sex	Age Class	Therefore Born	Individuals Inferred
1 male	4 or under	1825-1830	= nephew?
1 male	30-39	1790-1800	= John (b. 1780s)
1 female	15-19	1810-1815	= niece?
1 female	30-39	1790-1800	= Nancy

5.  1840 Census Index/Images (online at Ancestry.com, Image #5-6 of 14; extracted by Diana Gale Matthiesen):¤•

1840

PA

Venango Co.

Rockland Twp.

Roll M704_497

pp. 109B-110A

Ln. 7

Nancy Stroup

001 - 000 000 100

0100000

These data indicate:

No. & Sex	Age Class	Therefore Born	Individuals Inferred
1 male	10-14	1825-1830	= nephew?
1 female	40-49	1790-1800	= Nancy
1	person employed in agriculture

6.  Archives of the STRAUB-L and STROUP-L mailing lists (online at RootsWeb.com).

7.  Messages in the Stroup Family Genealogy Forum (online at GenForum.com).

8.  WorldConnect / Ancestry World Trees (online at RootsWeb.com/Ancestry.com).  A file there says John left his estate to the heirs of his siblings, which indicates he must not have had any surviving issue.  Among the legatees were William, Henry, and Ann MANSON, who may have been his wife's kin.