Chicago Metropolitan Agency for PlanningCMAP Subzones are units of geography that are used in the land use and transportation modeling activities of CMAP. Subzones are mostly derived from quarter sections, unless the subzone falls outside the CMAP planning area. This latest edition of the subzones (Subzone09) only contains one significant difference with the 2007 subzones (Subzone07). The subzones in Kendall County and Aux Sable Township (Grundy County) now are the size of quarter sections, just like the subzones in the 6 counties. Subzone09 now is comprised of 16819 subzones, up from 15401 in Subzone07.ArcGIS FeatureLayerhttps://hub.arcgis.com/datasets/9ddd110110ba4cf591f5cea5667cd16b_0engCMAP (Chicago Metropolitan Agency for Planning) Data HubPublicTrip Generation Zones - Subzones (2009) [Illinois--Chicago]Web servicesIllinois--ChicagoIllinois2009