city, Grayson county, north-central Texas, U.S., situated near the Oklahoma border, 73 miles (117 km) north of Dallas. The city of Sherman lies to the south and Lake Texoma, impounded on the Red River by Denison Dam, to the northwest. Originally a stop on the Southern Overland Mail Route, it was organized by the Missouri-Kansas-Texas Railroad in 1872 as a division point and named for George Denison, a railroad director.

Denison's economy is basically agricultural, augmented by light industry (chiefly clothing, aluminum, and plastic products), transportation, and tourism based on the Lake Texoma resort area, Hagerman National Wildlife Refuge, Eisenhower State Park, and the Denison Commercial Historic District (which comprises an 18-block area and more than 135 buildings). The birthplace (1890) of President Dwight D. Eisenhower (Eisenhower, Dwight D.) is preserved as a state historic site. Other attractions include the T.V. Munson Grape Viticulture & Enology Center, honouring Thomas Volney Munson, who was decorated with the French Legion of Honour for sending phylloxera-resistant rootstock and helping to save the wine industry of France in 1888. Inc. 1891. Pop. (1990) city, 21,505; Sherman-Denison MSA, 95,021; (2000) city, 22,773; Sherman-Denison MSA, 110,595.