Caddo Gap is an unincorporated community and census-designated place in Montgomery County, Arkansas, United States. It lies between Glenwood and Norman, on the Caddo River. It was first list…Caddo Gap is an unincorporated community and census-designated place in Montgomery County, Arkansas, United States. It lies between Glenwood and Norman, on the Caddo River. It was first listed as a CDP in the 2020 census with a population of 39.