Individual Details

John wasn't listed with his parents in the 1850 census. I do find him in:
1 Jun 1850, Salisbury, LaSalle Co., IL, stamped pg. 212:
Edward Swanson, 28 (1821-12) born Indiana, farmer; real estate $1500
Chloe A. Swanson, 25 (1824-25) born Ohio
Julius A Swanson, 9 (1840-41) born IL
John W Swanson, 7 (1842-43) born IL
Henry F Swanson, 2 (1847-48) born IL
George W. 1/12 (Apr-May 1850), born IL
Mary Swanson, 69 (1780-81) born Penn.
Andrew J Meyers, 14 (1835-36), born IL
John H. Swanson, 12 (1937-38), born IL.

1 Jun 1860, P.O. Visalia, Twp. 2, Tulare Co., CA, page 3, dwelling 21:
John Swanson, 40 (1819-20) born Indiana. Farmer, real estate $6, 000, personal property $2,500.
Anna Swanson, 41 (1818-19), born Ohio.
John Swanson, 23 (1836-37), born IL, farmer
Aaron Swanson, 21 (1838-39), born IL, farmer
Matilda Swanson, 17(1842-43), born IL
Miron Swanson, 15 (1844-45), born IL
Ruth Swanson, 4 (1855-56), born CA
Burton Swanson, 2 (1857-58), born CA

1870 Tulare Co., CA. Age 33 (1837), farmer, born IL. Also in household are:
Marian Swanson, 44 (1825-26), keeping house, , born OH
William A. Swanson, 13 (1856-57), born CA
Walter C Swanson, 11 (1858-59), born CA
Charles B. Swanson, 9 (1860-61, born CA
Lewis L. Swanson, 5 (1864-65, born CA
Mary E. Swanson, 2 (1867-68, born CA
If Marian is Mary E. Davis and they were just married in 1869, the children, possibly, are just hers or his from a previous marriage?? But he was listed in his father's household in 1860 with no children.

Jean Laws has him born Granville, Putnam Co., IL.

John Henry Swanson has a brand recorded in Book A pg 241, Tulare County brands. No date was shown for the recording.

Birth	31 Jan 1838	Illinois
Census	1 Jun 1850	Salisbury, LaSalle Co., Illinois
Census	1 Jun 1860	Twp 2, Tulare Co., California
Miscellaneous	1 May 1867	Visalia Weekly Delta reported J. H Swanson a delegate to County Convention for Outside Creek Precinct. - Tulare Co., California
Marriage	28 Jul 1869	Tulare Co., California - Mary E.
Census	1 Jun 1870	Venice Twp., Tulare Co., California
Voting Register	20 Sep 1884	#5997, Tulare Co., CA. Age 45 [1839], born IL, farmer in Kaweah. John Henry Swanson. - Tulare Co., California
Marriage	29 Mar 1886	Tulare Co., California - Nancy Ann SHERMAN
Voting Register	5 Aug 1896	Kaweah Precinct, Tulare Co., CA. 58, 5'9", farmer, dark complexion, gray eyes, dk gry hair, one eye nearly out, born Illinois, P.O. Lime Kiln. - Tulare Co., California
Death	24 Jan 1897	Tulare Co., California
Reference No		1535

Spouse

Mary E. (1825 - 1870)

Spouse

Nancy Ann SHERMAN (1848 - 1925)

Father	John Henry SWANSON (1812 - 1863)
Mother	Hannah SHERMAN (1819 - 1877)
Sibling	Aaron SWANSON (1839 - 1915)
Sibling	Edward J. SWANSON (1841 - 1842)
Sibling	Matilda SWANSON (1843 - 1926)
Sibling	Myron SWANSON (1846 - 1873)
Sibling	William SWANSON (1846 - 1846)
Sibling	Rachel SWANSON (1850 - 1852)
Sibling	Rachel Jane SWANSON (1852 - )
Sibling	Ruth SWANSON (1855 - 1898)
Sibling	Burton SWANSON (1858 - 1925)
Sibling	Oliver Perry SWANSON (1860 - 1926)