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Municipal Boundaries

Published by Lake County Illinois GIS | Lake County, Illinois | Catalog Last Checked: May 14, 2026 at 07:22 AM | Dataset Last Updated: May 10, 2026 at 11:16 AM
Download In State Plane Projection Here. Municipal boundaries are based on annexations, court orders and other legal documents filed in the office of the Recorder of Deeds. Mapping is based on the legal descriptions from those documents, which relate to existing parcel boundaries or to the underlying PLSS. Important attributes include "Type" which contains an "I" if the polygon represents an incorporated area, and a "U" if unincorporated. The municipality name for "I" type polygons is included in the attribute "NAME1." Update Frequency: This dataset is updated on a weekly basis.

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