Sumner County is the name of several counties in the United States:
Sumner County, Kansas
Sumner County, Tennessee
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The boundaries of the county were defined by the Legislature of 1867, and on May 27, 1868, a treaty was made with the Indians, and 8,000,000 acres of land sold to the L., L. & G Railway.
The county is bounded on the east by Cowley County, south by the State line and Indian Territory, west by Harper and Kingman, and north by Sedgwick County.
The principal water courses are the Arkansas and Ninnescah rivers, the former cutting across the northeast corner of the county, and the latter running from near the north-central line of the county to its confluence with the Arkansas at Oxford.