1.  Marriage Record:

2.  1830 Census Index/Images (online at Ancestry.com):  not found, but he may not have been married yet.

3.  1840 Census Index/Images (online at Ancestry.com):  can't find, and I really looked, including page-by-page checks of Bloomfield, Centre Twp., and Tyrone Twp. in Perry Co., PA.  Given that George was probably a widower — his youngest child was born in 1835/6 — he was probably living with another family, so did not get enumerated as head-of-household.

4.  1850 Census Every-Name-Index/Images (online at Ancestry.com; Image #11 of 14):  Borough of Bloomfield, [Centre Twp.,] Perry Co., PA, Roll, p. 428A/873, 72/84, enumerated 4 Sep 1850, official enumeration date 1 Jun 1850 (extracted by Diana Gale Matthiesen):¤•

George Stroop	45	M		Editor		Pa
Jane      "	16	F				"
George    "	14	M				"
John M Laird?	16	M		Printer		"

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

p. 341	CARSON LONG INSTITUTE, FORMERLY NEW BLOOMFIELD ACADEMY...
p. 342	[Paraphrasing: George Stroop was one of the founding directors of "The Bloomfield Seminary" in 1837.]
p. 476	The Liverpool Mercury, called after a paper in Liverpool, England, of the same name, was the second paper to be established in Perry County.  It was started by John Huggins, of a then prominent family in eastern Perry County.  It was started July 1, 1831, and was a five-column, four-page paper.  The subscription price was $2 per year.  In Jun, 1836, it was moved to New Bloom field, and published by James B. Cooper, who then owned it, as The Mercury and Perry Intelligencer.  He sold to Stroop & Sample, who merged it with the Perry County Democrat. George Stroop and James E. Sample, on Octoer 7, 1836, started the publication of The Mercury and Perry County Democrat, a five-column, four-page paper.  In December of the same year it was made a six-column paper.  Sample retired November 16, 1837, and from Stroop, who was an associate judge of the county at one time, in January, 1854, it passed to his son, George Stroop, and John A. Magee, a son of the early proprietor of the Forester.  In 1858 Stroop sold his interest to Magee, whose son, James S. Magee is the present owner...
p. 484	Several other county seat editors long stood out prominent in the annals of Perry County.  Two of them, John A. Magee and John H. Sheibley, were born in the same year, 1827, and throughout their long lives were close friends, although they represented opposing political parties.  John A. Magee was a son of Alexander Magee, editor of Perry County's first paper, The Forester, and Sarah (Crever) Magee.  His common school education was supplemented by a course at the Bloomfield Academy.  In 1854 he
p. 485	entered the office of George Stroop, then editor of the Perry County Democrat, to learn the printing trade.  He then followed printing elsewhere, after completing his trade, and taught school for a short time.  He was working as a journeyman in Washington, D.C., in 1853, and when George Stroop died in 1854, he and George Stroop, Jr. purchased the Democrat, Mr. Magee later (in 1858) securing entire control.  He served in the Pennsylvania Legislature during the session of 1862-63 as assemblyma.  In 1872 he was elected to Congress from the district composed of Perry, Cumberland and York Counties.  He conducted the Democrat until his death, November 18, 1903.  The Democrat under John A. Magee was noted for its strong and able support of democracy and all public policies.
p. 1042	An act of the Pennsylvania Legislature, dated April 4, 1838, provided for the building of the first bridge "at the Juniata's mouth," and named George Stroop [and 15 others] as stockholders.