Illinois Records Sangamon Co., IL in 1830 covered a lot more land than does the present county.
Included was all of Menard, and parts of Mason, Logan, Macon, and Christian Counties. Elijah Duncan and Temperance McKinney were married in Sangamon Co. but were in Christian Co. in the 1850 census. They may not have moved but Christian Co. came into being in 1840.
Marriages
Sangamon County Burrell McKenney to Nancy [Lillard] Pierce 4 Jul 1841
Charles McKenney to Sally Laughlin 26 Mar 1835
John McKenney to Mary Stout 23 Apr 1835
Temperance McKinney to Elijah Duncan 12 Mar 1835
Census records
Sangamon County 1830 Federal census
Name M 0-5 5-10 10-15 15-20 20-30 30-40 40-50 50-60 60-70 70-80 F 0-5 5-10 10-15 15-20 20-30 30-40 40-50 50-60 60-70 70-80 John McKinney M 0 1 1 0 0 0 0 0 1 0 F 0 0 2 0 0 0 0 1 0 0 Joseph McKinney M 2 1 0 0 1 0 0 0 0 0 F 1 1 2 0 1 1 0 0 0 0