Glenwood is a city in Pike and Montgomery counties in Arkansas. The community is located along the Caddo River in the Ouachita Mountains. Glenwood was formed as a boomtown following the development of the Gurdon and Fort Smith Railroad and timber interests in the area. After the establishment of a paper mill, the community received a post office and incorporated in April 1908. Although the community saw its major employer leave during the Great Depression, the city has again seen rapid growth in recent decades.