Jerree Where Red River and Sulphur Fork meet is right on the Montgomery Co and Robertson Co line. The property you are referring to could be in either county. Not much help. That county line runs north and south. Both counties border KY. T hat part of the line where the Red River and Sulphur Fork meet is about 8 miles south of the KY line. The Mont Co and Robertson Co line is define in that area by following the Red River from the north and following Sulphur Fork to the south. Otherwise the county line is fairly straight. William