1790 United States Federal Census
Name: John Hamlin
Home in 1790: Ware, Hampshire, Massachusetts
Free White Males 16 and over: 1 John
Free White Males Under 16: 1
Free White Females: 1 Lucy
Number of Household Members: 3

1800 United States Federal Census
Name: [John Hamlin]
Home in 1800: Wilbraham, Hampshire, Massachusetts
Free White Males Under 10: 1
Free White Males 10 thru 15: 2
Free White Males 26 thru 44: 1 John
Free White Females Under 10: 1
Free White Females 10 thru 15: 1
Free White Females 26 thru 44: 1 Lucy
Household Members Under 16: 5
Household Members Over 25: 2 (John and Lucy)
Household Members: 7

1810 United States Federal Census
Name: John Hamlin
Residence Date: 6 Aug 1810
Residence Place: Wilbraham, Hampshire, Massachusetts
Free White Males Under 10: 4
Free White Males 45 and over: 1 John
Free White Females 10 thru 15: 1
Free White Females 26 thru 44: 1 Lucy
Household Members Under 16: 5
Household Members Over 25: 2
Household Members: 7

1820 United States Federal Census
Name: John Hamlin
Enumeration Date: 7 Aug 1820
Home in 1820: Somers, Tolland, Connecticut, USA
Free White Males Under 10: 2
Free White Males 10 thru 15: 3
Free White Males 16 thru 18: 1
Free White Males 16 thru 25: 1
Free White Males 45 and over: 1 John
Free White Females 45 and over: 2 Lucy
Persons Engaged in Agriculture: 5
Free White Persons Under 16: 5
Free White Persons Over 25: 3
Total Free White Persons: 9

I am not certain of a cemetery for him.
Source: Connecticut, Hale Cemetery Inscriptions, 1675-1934 and the following website:
http://interactive.ancestry.com/2900/32971_302194-
00415/91205?backurl=http%3a%2f%2fsearch.ancestry.
com%2fcgi-bin%2fsse.dll%3fdb%3dhalecemetery
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I believe John and Lucy Barton Hamlin were parents of:
1. William Barton Hamlin (1787-1869) m. Margaret Manhart
2. Joseph (Mar 5, 1792-May 1870) m. Rachel (1794-?)
3. Oliver (Dec 26, 1794-1860) m. Harriet (d. 1845-1850)
4. Hon John (Oct 25, 1800-Mar 29, 1876) m. Cynthia (1808 - ?); m. Elizabeth Smith on Jan 19, 1826
5. Reuben Barton Hamlin (1803 - 1859); m. Betsey Reed (1815-1875) on Sept. 17, 1835
6. Orin (1807-?) m. Margaret Eads Oct 2, 1831
7. Asa R. (1810 - Mar 6, 1872) m. Abigail Loomis (1805-1856)
8. Chester (1814-?) m. Perris Cleveland (1816-?) on Oct 13, 1836
9. Lucy (1815-abt 1856) m John Bebee (1812 - abt 1856) in 1842
10. Ralph (1817-Feb 25, 1860) m. Elizabeth Fulton (1827-?) on Dec 11, 1843