Glenwood is a city in, and the county seat of, Mills County, Iowa, United States. The population was 5,073 in the 2020 census, a decline from …Glenwood is a city in, and the county seat of, Mills County, Iowa, United States. The population was 5,073 in the 2020 census, a decline from 5,358 in 2000. Located in a hollow of the Loess Hills on the east side of the Missouri River, Glenwood was established by Mormons in 1848 as Coonsville. It prospered during the California Gold Rush largely due to the grain mill on Keg Creek. Coonsville was the scene of anti-Mormon mob violence. It became the county seat of Mills County in 1851. In 1852, after most Mormons left for Utah, it was renamed Glenwood after a Presbyterian minister, Glenn Wood.
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