 gilman is a city in marshall county, iowa, united states. the population was 509 at the 2010 census. ==history== gilman had its start in the year 1870 by the building of the central railroad of iowa through that territory. the town is named for charles gilman, a railroad contractor. gilman was incorporated in 1876.{{cite book | url=http://books.google.com/boo
Cities_in_Iowa Cities_in_Marshall_County,_Iowa