Here is what we discovered for you.
First, the 1860 census index is complete, but the 1880 still lacks Ripley & Versailles townships, which we are in process of completing. We checked both those townships for your Kingree surname but found nothing.
1870 Fed Census, Mt. Sterling twp, Brown Co, IL 159/159:
Thornton Kingarie 48, farmer, $4000/$4000, b. VA
Mary Belle Kingarie 52, b. OH
1870 Fed Census, Mt. Sterling twp, Brown Co, IL 99/99:
Henry Kingery 25, farmer, b. IL
Flora Kingery 20, b. IL
Weston Kingery 2, b. IL
Cemeteries of Brown County, IL, p. 14 (Bowman Cem., Buckhorn twp):
Thornton Kingree (died 9 Dec 1891, aged 69y 9m 7d)
Mary Tice Kingree, wife of Thornton Kingree (died 18 Dec 1891, aged 73y 7m 13d)
I found quite a number of Kingery marriages in Illinois on the State Marriage Index:
We checked all other known indexes and biographical selections with no luck, and have no idea when they entered the county. This isn't a lot, but I hope it is of help to you.
Brown County, IL Lookups
Hello: I just visited your website courtesy of a Rootsweb search. I am researching the surname KINGREE, and notice two entries on your website. I had NO idea there were any Kingree's in Illinois, and I have been researching them for quite some time. On the 1870 Census index, you have the following two listings: Thornton Kingarie - MStwp 159Henry Kingry - MStwp 99 I did not find the surname on either the 1860 or 1880 census listings. Are these completed? Also on your Permanent Resident Index: Brown County Burials page there were two listings: Mary Tice Kingree - 14Thornton Kingree - 14 Would you please look up these two sets of records for me? I am extremely curious about them as this name is VERY rare and most of the family came from Virginia. Thank you so much for your time.. Pamela (Kingree) Moats