Castle Fin is an unincorporated community in Clark County, Illinois, United States. Castle Fin is north-northwest of Marshall. The community was founded by Robert Wilson and platted in 1848. Wilson named Castle Fin after his hometown of Castlefin in County Donegal, Ireland.Genealogy Trails - Castle Fin, Clark County, Illinois

Since 2010, it has been home to a winery and event venue.

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