Chicago Metropolitan Agency for PlanningThese subzones are units of geography that are used in CMAP's transportation modeling activities. Subzone boundaries are derived from the Public Land Survey System (PLSS). This version of the CMAP modeling subzones differs from previous versions in that there are a few hundred more subzones. Previous Census-based subzone boundaries have been replaced to give all subzones PLSS-based boundaries.ArcGIS FeatureLayerhttps://hub.arcgis.com/datasets/d52c6a01a673495698e57da02d33d4fe_0engCMAP (Chicago Metropolitan Agency for Planning) Data HubPublicTrip Generation Zones - Subzones (2017) [Illinois--Chicago]Web servicesIllinois--ChicagoIllinois2017