1.  LDS.  Family Search: Internet Genealogy Service: International Genealogical Index (IGI).

Peter WOLF Spouse: Nancy RICHMOND Marriage: 1803, Washington, Pennsylvania Source: official temple record of deceased individual*

*which may be from a patron submission

2.  Census Index:  U.S. Selected Counties, 1800 (Broderbund CD-312):
Our subject supposedly did not marry until ca. 1803, so we would not expect to find him in the census.  However, both Peter and Nancy are old enough to have married before 1800 and even to have had a child or two before 1800.  There is a Peter WOLF in the 1800 census of Washington Co., PA, but he is an older man with six children.  There is, however, a John WOLF and wife who are the right age to be our subjects and who have just two daughters, both under age 10.  If, like his father, our subject was originally named John Peter, in the German fashion where the middle name is the name the person "goes by," then it is conceivable that this record is of our subject.  Otherwise, he is not in the census, as expected.

3.  Census Index:  U.S. Selected Counties, 1810 (Broderbund CD-313):  no WOLFs/&c. in Knox Co., OH, and no Peter WOLFs/&c. in Washington Co., PA.  Please see my WARNING regarding use of this database (the numerical data have the genders switched). 

1810	Woulfe, Peter	VA	Ohio Co.	p. 15	01002-0000100
1810	Woulfe, Peter, Jr.	VA	Ohio Co.	p. 15	10010-3001000

Other WOULFE/WOLF/&c. in Ohio Co.:  George WOULFE (on p. 15).

4.  Census Index:  U.S. Selected Counties, 1820 (Broderbund CD-314):

1820	Wolf, Peter	OH	Knox Co.	Jackson Twp.	p. 89
1820	Wolff, Peter	OH	Knox Co.	Wayne Twp.	p. 89

Without the numerical data, I can't tell which is our subject and which is his father, (John) Peter, but they both came to Knox Co.  Other WOLFs/WOLFFs in Knox Co.: Christopher (p. 94), George (p. 89), and John (p. 89).

5.  Census Index:  U.S. Selected Counties, 1830 (Broderbund CD-315):

1830

Woolf, Peter

OH

Knox Co.

Butler Twp.

p. 218

Other WOLFs/WOOLFs/&c. in Butler Twp.: Absolum, Catharine, and John (all on p. 218).

6.  Census Index:  U.S. Selected Counties, 1840 (Broderbund CD-316):

1840

Woolf, Peter

OH

Knox Co.

Butler Twp.

p. 409

Other WOLFs/WOOLFs/&c. in Butler Twp.:  Sarah Ann and Simon (both on p. 409).

7.  Family Quest Archives:  Ohio Federal Census 1850: Knox County.  Heritage Quest CD M432-700:  Butler Twp., Knox Co., OH, pp. 398B-399A, 2459/2519, enumerated 24 Sep 1850 (extracted by Diana Gale Matthiesen):

Peter Wolf	70	M	Farmer	3500	Penn
Nancy   "	68	F			"
Isaac Wolf	22	M	Farmer		Ohio
Harriet "	20	F			"
Peter   "	14	M			"
Mary L  "	2	F			"

Isaac is their son and Harriet his wife, with Mary their daughter.  Isaac's age is wrong; it should be 32, not 22.  Peter Wolf is Peter & Nancy's orphaned grandson, child of their son, Peter, and his wife, Mary, both of whom died in 1838.

8.  WorldConnect (online at RootsWeb.com).