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 lumber mill, the community received a post office and incorporated in April 1909. Although the community saw its major employer leave during the Great Depression, the city has again seen rapid growth in recent decades. The city also sees significant tourism related to its scenic position in the Ouachitas and among several recreational lakes.