1.  Marriage Record:

2.  Census Index:  U.S. Selected Counties, 1830 (Broderbund CD-315):  not found, as expected.  DUNLAPs in Centre Co., PA, were:  Alexander, Daniel, Elza, Jacob, and Jefferson.

3.  1840 Census Index and Digital Images (online at Ancestry.com; Image #11-12 of 34; extracted by Diana Gale Matthiesen):

1840

PA

Centre Co.

Harris Twp.

pp. 126B-127A

James Dunlap

000 210 - 200 010

000300

These data indicate:

No. & Sex	Age Class	Therefore Born	Individuals Inferred
2 males	15-19	1820-1825	= ? = ?
1 male	20-29	1810-1820	= James (b. 1813/4)
2 females	4 or under	1835-1840	= Sarah (b. 1838/9) = Susan (b. 1836/7)
1 female	20-29	1810-1820	= Mary (b. 1813)
3	persons engaged in manufactures & trades

The two teenage males are too old to be James's sons — brothers, perhaps?  Listed five lines below Piersol LYTLE, husband of Mary (JOHNSTONBAUGH) DUNLAP's sister, Lydia JOHNSTONBAUGH. 

4.  Census Index:  U.S. Selected Counties, 1850 (Broderbund CD-317):  can't find.

5.  1860 Census Images (online at Ancestry.com; Image #10 of 45):  Pine Grove Mills P.O., Furguson Twp., Centre Co., PA, p. 416, PN 154, 1088/1119, enumerated 17 Jul 1860 (extracted by Diana Gale Matthiesen):

James Dunlap	46	M		Inkeeper	2313	1500	Penna
Mary     "	46	F					"
Susan J  "	23	F					"
Sarah E  "	21	F					"
Eliza    "	19	F					"
Mary G   "	17	F					"
George Ard	43	M		Miller			"
Samuel Felty	24	M		Cabinet Maker			"
John Musser	45	M		Stage Driver			"
William Sivison	10	M					"
James Taylor	34	M		Day Laborer			"

6.  1870 Census Images (online at Ancestry.com; Image #3 of 54):  Pine Grove Mills P.O., Ferguson Twp., Centre Co., PA, p. 433A, PN 3, 24/24, enumerated 2 Jun 1870 (extracted by Diana Gale Matthiesen):

Dunlap Jas	56	M	W	Retail Merchant	400	4000	Penna
______ Eliza	27	F	W	Keeping house			"
Wilten C	4	M	W				"
Alexander L M	20?	M	W	Clk in store			"

Mary died in 1867.  Eliza appears to be fibbing about her age.

7.  1880 United States Census and National Index (LDS Family History Resource File: CD-ROM Library).  For full records, see H.M. STOVER's family group sheet. 

Census Place: Pine Grove Mills, Centre, Pennsylvania
Source: FHL Film 1255113; NARA Film T9-1113; Pg 412A
	Relation	Sex	Marr	Race	Age	Birthplace	Occupation	Fa	Mo
H. M. STOVER	Self	M	M	W	34	PA		PA	PA
[H.M.'s wife and children]
James DUNLAP	Other	M	W	W	66	PA	Retired Merchant	PA	PA

In checking the digital image of this page (online at Ancestry.com), the "Relation" column for James DUNLAP is blank, but "boarder" is inserted above his occupation.  Also, the comment, "lung disease," is written in to the right of his occupation.