Denison, Texas is located in northeastern Grayson County on U.S Highway 75, just 75 miles north of Dallas and 4 miles south of the Texas/Oklahoma border. State Highway 120 passes through Denison from east to west, and State Highway 84 borders northern Denison, providing direct access to Lake Texoma, the twelfth largest man-made lake in the U.S. The residents enjoy a gently rolling and wooded terrain which stretches northward to the shores of Lake Texoma and the Red River.
Grayson County is the 35th largest of 254 counties in Texas with a 2017 estimated population of just over 131,400. Sherman is the county seat of Grayson county while Denison, located adjacent, is the next largest city. Grayson County consists of 940 square miles with a population density of approximately 129 residents per square mile. Denison consists of 24.6 square miles (24.0 land / 0.6 water).