Vivian, I don't think the man in Barry, MO is the same man. Here's a Missouri marriage record that fits with that 1870 census record but doesn't fit with the 1850 and 1860 census records in IL:

NAME: Jefferson King
MARRIAGE DATE: 1 Aug 1858
MARRIAGE LOCATION: Barry, Missouri
MARRIAGE COUNTY: Barry
SPOUSE NAME: Mary White


1850 census Franklin Co, IL - 10 Sep 1850

Jefferson King 35 M Farmer TN
Mary Ann 21 F IL
Luticia J 14 F IL
Eliza A 12 F IL
Jno S 9 M IL
Amand E 7 F IL
Wm J 4 M IL
Jas A 2 M IL


1860 census T4SR3E Jefferson Co, IL - 23 June 1860
Post Office: Spring Garden

Jefferson King 45 M Farmer TN
Mary 32 F IL
John S 20 M IL
Elizabeth 17 F IL
William J 14 M IL
James A 12 M IL
Joseph A 9 M IL
Nancy J 6 F IL
Francis M 4 M IL