The city of 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 that stretches northward to the shores of Lake Texoma and the Red River.
Grayson County is the 34th largest of 254 counties in Texas with a 2024 estimated population of just over 150,271. The county has experienced population growth of more than 24% since 2010. Sherman is the county seat of Grayson County while Denison, located adjacent, is the next largest city. Grayson County consists of 979 square miles with a population density of approximately 161 residents per square mile. Denison consists of 24.6 square miles (24.0 land / 0.6 water).