Individual Details

He is seen often with the middle name "Thomas" - I doubt this, particularly since he had a brother named Thomas.

1850 Census. Des Moines, Van Buren Co, Iowa, Hh 74
Samuel Hannan, 53, b. KY
Martha 46, b. VA
Margaret, 25, b. KY
Martha, 23, b. KY
Samuel, 20, b. KY
Mary, 17, b. ?Ill,
Wm, 14, same as Mary
Susan, 8, b. Iowa
Lucretia, 6, b. Iowa

An article written about son John D. Hanan, indicates the family lived in Fulton Co, Illinois. There were three Hannon households there in 1830, but none by 1840.
Samuel Hannon: 1m -5, 1m 5-10, 1m 30-40. 3f -5, 1f 5019, 1f 20-30
John Hannon, 1m 10-15, 1m 40-50. 2f -5, 2f 5-10, 1f 30-40
Richard Hannon, 1m age 20-30

Birth	15 Apr 1795
Marriage	29 May 1820	Logan County, Kentucky - Patsy Price
Death	13 Apr 1852	Des Moines, Polk County, Iowa

Spouse	Patsy Price (1803 - 1860)
Child	James Hanan (1821 - 1856)
Child	Margaret Hanan (1825 - )
Child	Martha Hanan (1827 - )
Child	John Dixon Hanan (1827 - 1898)
Child	Samuel Hanan (1831 - 1906)
Child	Mary Hanan (1833 - )
Child	William Hanan (1836 - )
Child	Susan Hanan (1842 - )
Child	Lucretia Hanan (1844 - )
Child	Oscar Bradford Hanan (1846 - 1850)

Father	James Marshall Hanan (1771 - 1811)
Mother	Margaret "Peggy" McFall (1771 - 1824)
Sibling	James Hanan (1793 - )
Sibling	John Hanan (1795 - 1831)
Sibling	Sarah Hanan (1800 - 1880)
Sibling	Thomas Boyd Hanan (1803 - 1860)
Sibling	Polly Hanan (1805 - )
Sibling	Elizabeth Hanan (1807 - )
Sibling	Mary Ann Hanan (1808 - )
Sibling	Archimedes Hanan (1810 - 1902)