Grayson County, in North Central Texas , is bordered by the Red River and by Fannin, Collin, Denton, and Cooke counties. The county seat, Sherman, which lies approximately sixty-five miles north of Dallas, is part of the Sherman-Denison Metropolitan Statistical Area. Grayson County is 934 square miles in area. The northern part, which drains into Lake Texoma and the Red River, is characterized by acidic soils of the Post Oak Belt, with loamy or sandy surfaces. The southern areas, which drain to tributaries of the Trinity River , have blackland soils conducive to the growth of trees such as post oak, bois d'arc, elm, and walnut, as well as various types of grasses. Natural resources include limestone, oil and gas, bituminous coal, sand and gravel. Grayson County is drained principally by Choctaw Creek and its two main tributaries, Post Oak and Iron Ore creeks.  
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