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is a city located in Wise County, Texas, United States. This city was named after Stephen Decatur, Jr. As of the 2007 census, the city had a total population of 6,275. It is the county seat of Wise County. Decatur is part of the Dallas/Fort Worth Metroplex. It is 22 miles (20 minute drive) from Denton, Texas; 25 miles (25 minute drive) from Fort Worth, Texas; and 47 miles (55 minute drive) from Dallas, Texas. Decatur is one of the fastest growing cities in Texas, while Wise County is the fourth fastest growing county in Texas.