Gilman is a city in the southeastern corner of Marshall County, Iowa, United States. The population was 542 at the time of the 2020 censu…Gilman is a city in the southeastern corner of Marshall County, Iowa, United States. The population was 542 at the time of the 2020 census. Gilman got its start in the year 1870, following construction of the Central Railroad of Iowa through the territory. The town is named for Charles Gilman, a railroad contractor. Gilman was incorporated in 1876. Gilman celebrates No-Rivers Day at the Gilman No-Rivers Festival. The annual festival is orchestrated by the Gilman Events committee.
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