— born in PA, either Berks Co., PA, or Cumberland [now Perry] Co., PA
3.  Mary STROOP, b. 22 Dec 1795
4.  Elizabeth STROOP, b. 13 Sep 1799; d. 24 Mar 1803
5.  (Daughter A) STROOP, b. 1800-1810

— born in Cumberland [now Perry] Co., PA:
6.  George STROOP II, b. 1804/5, PA

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

GEORGE STRUPP Spouse: BARBARA REIM Marriage: 26 Jun 1791, Saint Paul Lutheran and Reformed Church, Amityville, Berks, Pennsylvania Source: Film/Fiche No. 1421705, Item #13: Amityville Church Records, Berks County, Pennsylvania. St. Paul's Lutheran Church (Amity Township, Berks County, Pennsylvania)

2.  John T. Humphrey.  1991-1998.  Pennsylvania Births.  14 vols.  Self-published, Washington, DC (Broderbund Family Archives: Birth Index: Southeastern PA, 1680-1800, CD-196):

Child	Samuel Strupp	Jacob Strup
Birth/Baptism Date	3 Jan 1792	14 Jan 1794
Location	First Reformed Church, Reading	Schwartzwald Reformed Church, Exeter Township
County	Berks	Berks
State	Pennsylvania	Pennsylvania
Father	George Strupp	Georg Strup
Mother	Mrs. ??? Strupp	Mrs. ??? Strup

3.  1790 Census Index/Images (online at Ancestry.com):  can't find. 

4.  1800 Census Index/Images (online at Ancestry.com):  can't find.

5.  1810 Census Index/Images (online at Ancestry.com; Image #3 of 11; extracted by Diana Gale Matthiesen):¤•

1810

PA

Cumberland [now Perry] Co.

Tyrone Twp.

Roll M252_48

p. 108

Ln. 39

George Stroop

10201-11001-01

These data indicate:

No. & Sex	Age Class	Therefore Born	Individuals Inferred
1 male	9 or under	1800-1810	= George II (b. 1803/4)
2 males	16-25	1784-1794	= Samuel (b. 1790-94) = Jacob (b. 1792/3)
1 male	45 or over	in or bef. 1765	= George I
1 female	9 or under	1800-1810	= Daughter A
1 female	10-15	1794-1800	= Mary (b. 1795)
1 female	45 or over	in or bef. 1765	= Barbara
1 slave	all ages	in or bef. 1810	= ?

If it's correct that both George and Barbara were born before 1765, as it shows here, then their marriage in 1791 was a late first marriage for both of them.  It was very unusual for a Pennsylvanian to have a slave, which makes me wonder if our subject didn't come to Pennsylvania from a southern state (viz., Maryland or Virginia).

6.  1820 Census Index/Images (online at Ancestry.com):  not found, as expected, but two sons appear for the first time (viz., Jacob and Samuel).

7.  Harry Harrison Hain.  1929.  History of Perry County, Pennsylvania.  Hain-Moore Co., Harrisburg, PA (online at HeritageQuest at Genealogy.com):

p. 255	On Jun 25, 1813, Zachariah Rice purchased from George Stroop, who then owned it, twenty-five acres, being a part of the Abraham Landis tract, on which was a house erected partly of logs and partly of brick and a gristmill.
p. 1056	SPRING TOWNSHIP...
p. 1057	...In February, 1803, George Stroop warranted 250 acres adjoining lands, which he had purchased west of Landisburg.  While living in this vicinity Stroop was sheriff of Cumberland County.  When the county was formed his heirs were assessed with over 1,300 acres of land. Stroop's main tract, passed to Martin Swartz in 1822...[goes on to give the history of the tract's ownership]

8.  Archives of PAGenWeb (online at ftp://rootsweb.com):

History: 1821: Genealogical Data contained in the Statutes at Large, Commonwealth of PA... File contributed for use in USGenWeb Archives by: Vi. P. Limric... LAWS PASSED SESSION 1819/20 HARRISBURG, PA... Be it enacted by the Senate and House of Representatives of the Commonwealth of Pennsylvania.  In General Assembly met and is hereby enacted by the Authority of the Same... 121. An act authorizing sundry persons to sell and convey estates... That the administrators of GEORGE STROOP, dec., JACOB STROOP and JOHN SHUMAN, are hereby authorized to execute a deed, for four lots of ground in the town of Landisburg, Perry county, #1, 2, 23, and 24, with their tenements and appurtenances, to the administrators of JOHN HIPPLE, in trust for the use the heirs, as soon as the administrators of John Hipple shall have paid to Jacob Stroop and John Shuman the balance of the purchase money.

John SHUMAN is George's son-in-law, husband of his daughter, Mary.

9.  Messages posted to the STROOP Surname Board (online at Ancestry.com).