Denison is a city in Grayson County, Texas, United States, 1 mile south of the Texas–Oklahoma border. Its population was 24,479 at the 2020 c…Denison is a city in Grayson County, Texas, United States, 1 mile south of the Texas–Oklahoma border. Its population was 24,479 at the 2020 census, up from 22,682 at the 2010 census. Denison is part of the Texoma region and is one of two principal cities in the Sherman–Denison metropolitan statistical area. Denison is the birthplace of U.S. President Dwight D. Eisenhower.
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