— born in Henderson, Jefferson Co., NY:
3.  Henry Kellogg HOPKINS, b. 15 Jun 1807; d. 1840s; no issue 
4.  William HOPKINS, b. 18 Sep 1811; d. 31 Jan 1815, Henderson, Jefferson Co., NY; no issue
5.  Mark HOPKINS, b. 1 Sep 1813  {1870: 54, NY}; no issue 
6.  Moses HOPKINS, b. 19 Jan 1817 
7.  Ezra Augustus HOPKINS, b. 22 Sep 1821; d. 14 Aug 1865, Sacramento, Sacramento Co., CA; unmarried, no issue [went by Augustus]

Augustus Kellogg is said to have died in Great Barrington, but the family had already moved to Henderson by that time.  Either Augustus died in Henderson or his date of death is incorrect.

1.  Timothy Hopkins.  1932.  John Hopkins of Cambridge, Massachusetts, 1634, and Some of His Descendants. Stanford Univ. Press, Stanford, CA.  Source for children was subjects' family bible.

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

Mark HOPKINS  Spouse: Anastasia Lukens KELLOGG Marriage: 19 Oct 1800, Great Barrington, Berkshire, Massachusetts Source: [patron submission]

3.  1810 Census Index and Digital Images (online at Ancestry.com; Image #3 of 5; extracted by Diana Gale Matthiesen):

1810

NY

Jefferson Co.

Henderson town

p. 16/506

Mark Hopkins

20110-00010-00

These data indicate:

No. & Sex	Age Class	Therefore Born	Individuals Inferred
2 males	9 or under	1800-1810	= Henry (b. 1807) = Augustus (b. 1801)
1 male	16-25	1784-1794	= ?
1 male	26-44	1765-1784	= Mark (b. 1779)
1 female	26-44	1765-1784	= Anastasia (b. 1780)

Samuel is away at school, back in Great Barrington.  Hard to say who the older boy is.  They are listed two lines below Jas. KELLOG, who is one line below Chas. KINNEY.  Also in Henderson:  Thankful HOPKINS (Image #2) and Jesse HOPKINS (Image #5).

4.  1820 Census Index and Digital Images (online at Ancestry.com; Image #3 of 5; extracted by Diana Gale Matthiesen):

1820

NY

Jefferson Co.

Town of Henderson

p. 421

Mark Hopkins

201110-10110-0200

Note that these records have an extra two columns, beyond the standard Federal form for 1820.  These data indicate:

No. & Sex	Age Class	Therefore Born	Individuals Inferred
2 males	9 or under	1810-1820	= Moses (b. 1817) = Mark (b. 1813)
0 males	10-15	1804-1810	= Henry (b. 1807)
1 male	16-18	1801-1804	= Samuel (b. 1803)
1 male	26-44	1775-1794	= Mark (b. 1779)
1 female	9 or under	1810-1820	= ?
1 female	16-25	1794-1804	= ?
1 female	26-44	1775-1794	= Anastasia (b. 1780)
2	engaged in agriculture
*In the 1820 Census, the third column is age class 16-18 and the fourth column is age class 16-25; therefore, any individual in column three is duplicated in column four.

Is it Henry's turn to be away at school?  He did become a lawyer, so he probably would have had to have gone away to school to become one.  Mark and Anastasia are not known to have had any daughters.  Of the two younger females, the older one could not be their daughter, in any case, because she did not appear in the 1810 census.  The youngest female could be their daughter, perhaps one who died young, though she is more likely the daughter of the other female.  They are listed eleven lines below Jesse HOPKINS.  Also in Henderson:  Kersiah CRITTENDON (Image #2).

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

1830	Hopkins, Mrs. Tacy L.	MI	St. Clair Co.	St. Clair Twp.	p. 141
1834	Hopkins, Mrs. Tacy L.	MI	St. Clair Co.	St. Clair Twp.

5b.  1830 Census of Michigan Territory: St. Clair County (produced by and online at the Kent County MIGenWeb Project):  enumerated on 26 Oct 1830:

1830

Mrs. Tacy L. Hopkins

MI

St. Clair Co.

St. Clair Twp.

01111-0010011

These data indicate:

No. & Sex	Age Class	Therefore Born	Individuals Inferred
1 male	5-9	1820-1825	= Ezra (b. 1821)
1 male	10-14	1815-1820	= Moses (b. 1817)
1 male	15-19	1810-1815	= Mark (b. 1813)
1 male	20-29	1800-1810	= Samuel (b. 1803)
1 female	10-14	1815-1820	= ?
1 female	30-39	1790-1800	= ?
1 female	40-49	1780-1790	= Anastasia (b. 1780)

Again, Henry appears not to be with the family, nor is he head-of-household somewhere that I can find.  The same two females appear to be with Anastasia in 1820 and in 1830.

6.  Mark Hopkins.  New York Genealogical and Biographical Records 43(1912): 259.

Born Great Barrington, June 29th, 1779; died Nov. 27th 1828, at St. Clair, Mich.  He was a son of Moses and Anna (Whiting) Hopkins.  He moved to Henderson, NY in 1805.  He was a Captain of Volunteers in the War of 1812 and state representative.  He moved with his family to St. Clair, Mich. in 1824 and was Judge of Probate and Postmaster there.  7 children, first 2 born in Great Barrington and rest born in Henderson, NY.