Dallas is an extinct town in Ouray County, Colorado, United States. Also known as Dallas City, it lay about 3 miles north of the present town of Ridgway at the confluence of Dallas Creek and the Uncompahgre River. The Dallas post office operated from February 11, 1884, until October 31 1899. A community named in tribute to the historic town bearing the …Dallas is an extinct town in Ouray County, Colorado, United States. Also known as Dallas City, it lay about 3 miles north of the present town of Ridgway at the confluence of Dallas Creek and the Uncompahgre River. The Dallas post office operated from February 11, 1884, until October 31 1899. A community named in tribute to the historic town bearing the name Dallas Meadows now exists near its historic location.