• Northeastern Illinois County GIS Cooperative Program
• United States Geological Survey
• CMAP
• US Census Bureau
• FEMA
• IDNR
• National Geodetic Survey 

  Other Counties GIS

·         • Cook County, IL
• Dekalb County, IL
• Dupage County, IL
• Kane County, IL
• Lake County, IL
• Will County, IL
• Kenosha County, WI
• Walworth County, WI 

  Associations/Companies

·   ESRI

·   ILGISA

·   URISA