This is the Texas A&M AgriLife Extension Service website for Grayson County Texas. We are located North of Dallas on the Oklahoma border. Grayson County has a population of approximately 120,000 persons. Sherman is the county seat and Sherman and Denison are the two largest cities, both of which are located just off highway 75. There are 13 independent school districts and several private and charter schools.
The Grayson County border is marked with the Red River and beautiful Lake Texoma separating us from Oklahoma.
Grayson County is bordered by Collin and Denton County to the South, Cooke County to the West, and Fannin County to the East. Major highways include Highway 75, Highway 289 and Highway 377, running north south. Highway 82 and Highway 56 run east west.