— born in Cass Twp., Huntingdon Co., PA:
6.  William H. CORBIN, b. 1844/5
7.  Enoch E. CORBIN, b. 1846/7

1.  Marriage Record:

2.  1830 Census Index and Digital Images (online at Ancestry.com; Image #17 of 18; extracted by Diana Gale Matthiesen):

1830

PA

Huntingdon Co.

Union [now Cass] Twp.

p. 22

Asa Corban

100 001 - 100 010

These data indicate:

No. & Sex	Age Class	Therefore Born	Individuals Inferred
1 male	4 or under	1825-1830	= Amos (b. 1827/8)
1 male	30-39	1790-1800	= Asa (b. 1792/3)
1 female	4 or under	1825-1830	= Mary (b. 1829/30)
1 female	20-29	1800-1810	= Nancy (b. 1806/7)

3.  1840 Census Index and Digital Images (online at Ancestry.com; Image #1 of 10; extracted by Diana Gale Matthiesen):

1840

PA

Huntingdon Co.

Union [now Cass] Twp.

p. 263B

Asa Corbin

001 000 100 - 211 001 000

These data indicate:

No. & Sex	Age Class	Therefore Born	Individuals Inferred
1 male	10-14	1825-1830	= Amos (b. 1827/8)
1 male	40-49	1790-1800	= Asa (b. 1792/3)
2 females	4 or under	1835-1840	= Margaret (b. 1839/40) = Diana (b. 1837/8)
1 female	5-9	1830-1835	= Sarah (b. 1834/5)
1 female	10-14	1825-1830	= Mary (b. 1829/30)
1 female	30-39	1800-1810	= Nancy (b. 1806/7)

Listed one line above Elijah DEAN, who is one line above Benjamin GREENLAND, who is one line above Ezekiel CORBIN.

4a.  1850 Census Index/Microfilm (online at GenealogyLibrary.com):  Cass Twp., Huntingdon Co., PA, Roll 784, p. 209AB, 68/68, enumerated 14 Oct 1850 (extracted by Diana Gale Matthiesen):

Asa Corbin	51	M	Farmer	1600	Md
Nancy Corbin	43	F			Pa
Amos L    "	22	M	Farmer		"
Mary      "	20	F			"
Sarah J   "	15	F			"
Dianna    "	12	F			"
William H "	5	M			"
Enoch E   "	3	M			"
Enoch Dean	72	M	Farmer	3000	"

Enoch is Nancy's father.  They are listed next to Abraham SHORE, a widower whose late wife was Enoch's sister, Nancy DEAN. 

4b.  1850 Census Index/Microfilm (online at GenealogyLibrary.com):  Cass Twp., Huntingdon Co., PA, p. 211, 108/108, enumerated 17 Oct 1850 (extracted by Diana Gale Matthiesen):

Mathias Miller	50	M	Farmer	1800	Md
Mary      "	51	F			Pa
Christian Waggoner?	12	M			"
Ashahel Corbin	50	M	Farmer		Md

Is this our subject?  If so, how did he manage to get enumerated twice?

4c.  1850 Census Index/Microfilm (online at GenealogyLibrary.com):  Cass Twp., Huntingdon Co., PA, p. 209B-210A, 78/78, enumerated 15 Oct 1850 (extracted by Diana Gale Matthiesen):

Robert Oatman	33	M	Carpenter	300	Pa
Susan J   "	25	F			"
Frances E	3	F			Pa
Margaret Corbin	10	F			"

Margaret is listed ten households from Asa & Nancy.

5.  1860 Census Images (online at Ancestry.com; Image #6-7 of 23):  Mount Union P.O., Union Twp., Huntingdon Co., PA, pp. 628-629, PN 127-128, 903/897, enumerated 1 Aug 1860, official enumeration date 1 Jun 1860 (extracted by Diana Gale Matthiesen):

Asa Corbin	61	M		Farmer	1800	200	Pa
Nancy  "	54	F					"
[next page]
Sarah J Corbin	24	F					Pa
W. Henry   "	17	M					"
Enoch E    "	13	M					"

Listed next to daughter and son-in-law, Asher & Mary (CORBIN) KELLY, on one side; and, in the other direction, listed six households from John DEAN (æ 48, b. PA, wife Syntha). 

6.  1870 Census Images (online at Ancestry.com; Image #3 of 20):  Huntingdon P.O., Union Twp., Huntingdon Co., PA, p. 818A, PN 3, 15/16, enumerated 15 Jul 1870, official enumeration date 1 Jun 1870 (extracted by Diana Gale Matthiesen):

Corbin Asa	70	M	W	Farmer	2500	300	Maryland
______ Nancy	65	F	W	Keeping house			Penna
Kelly Mary wid	42	F	W	At home			Do
_____ Leanna	14	F	W				Do
_____ H William	10	M	W				Do

Mary is our subjects' widowed daughter.

7.  1880 United States Census and National Index (LDS Family History Resource File: CD-ROM Library):

Census Place: Mapleton, Huntingdon, Pennsylvania
Source: FHL Film 1255134; NARA Film T9-1134; Pg 243D
	Relation	Sex	Marr	Race	Age	Birthplace	Occupation	Fa	Mo
Mary KELLY	Self	F	W	W	50	PA	Keeping House	MD	PA
[Mary's children]
Asa CORBIN	Other	M	W	W	80	MA	Occupation	MA	MA

Mary is Asa's widowed daughter.

8.  1880 Census Images (online at Ancestry.com; Image #20 of 25):  Mapleton Borough, Huntingdon Co., PA, p. 243D, PN 20, SD 7, ED 197, enumerated 2 Jun 1880, official enumeration date 1 Jun 1880.  I checked the digital image online at Ancestry.com, and it's "Md Md Md," not "Ma Ma Ma."  For Relationship, it says, "boarder," and for Occupation, I think it says, "no occupation" or "not occupation" (it's very hard to read).