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GIS/Mapping Division  


Thank you for visiting the Lake County Geographic Information System (GIS) / Mapping Division web pages. The GIS/Mapping Division is part of Lake County's Department of Information Technology. We are responsible for the maintenance of parcel maps and taxing district boundary maps used in the tax assessment process and for many other purposes. There are over 6,500 individual parcel map pages, all of which may be viewed in our Tax Assessment Map Gallery. An additional 1,300 tax district boundary maps may be found in our various PDF Map Galleries.

We have developed an interactive web site Maps Online for public access which lets citizens and businesses use GIS tools to explore, answer questions and make maps on the Internet. We also support and coordinate the development of GIS computer applications in county agencies and work with almost 150 federal, state, regional and local government agencies and non-profit organizations to promote the growth of GIS and its use to benefit citizens in our area.

Our office also offers a number of digital data products for free download, including aerial photography, contour data and numerous other GIS themes.

History of GIS/Mapping in Lake County

Lake County started a mapping program in 1941. The newly created Map Department was responsible for providing tax parcel and tax district maps and for the maintenance of a systematic series of card files with property ownership records for use by county departments and the public. In 1981 the Map Department became a division of what is now the Department of Information Technology and was renamed the Map Division. An interdepartmental study group was then formed to explore the benefits and implementation of a countywide GIS. A vision of a multi-application, multi-agency, broadly based program that would support many county projects and operations was developed. The Map Division was renamed to the GIS/Mapping Division with the assignment of implementing this new vision.

In the 30 plus years since its creation, a fully mature, well respected and effective GIS has been developed. The Division now handles a far larger workload with fewer staff than it did 30 years ago. In addition to the annual publication of over 7,000 maps, the GIS/Mapping Division also coordinates, develops custom applications and provides training and support for the countywide GIS which directly benefits the public and many other local, state and federal government agencies. During the economic downturn starting in 2008, our customers increasingly relied on geospatial analysis and services to help efficiently enhance and extend their business operations. This reliance underlines the value an established GIS, along with seasoned professional staff, affords Lake County and its citizens.


Tax System and Land Records

  • Ensure accurate, complete and timely entry of a significant portion of the county’s tax system
  • Subdivide and consolidate tax parcels pursuant to deeds, subdivision plats and other legal documents, and by request for tax assessment and billing purposes
  • Work with surveyors, lawyers and other document originators to correct errors in legal documents
  • Initial assignment of Permanent Index Numbers (PIN) to tax parcels
  • Assign addresses in unincorporated Lake County and by those municipalities that request this service
  • Maintain and publish tax parcel maps and tax district maps

Customer Service

  • Provide a high level of service to both internal and public customers
  • Provide assistance to the public in interpreting, understanding and purchasing map and GIS data products
  • Provide technical assistance to departments that empowers them to leverage the benefits of GIS to support their individual business requirements
  • Provide coordination so that all county GIS users create compatible data that integrates with the county program
  • Publish tax parcel maps and other GIS data on the Internet
  • Support county programs (Emergency Operations Center; Sheriff’s Dispatch Center, Central Permit Facility, etc.)

GIS Data Development

  • Acquire or develop and maintain data layers needed for county applications that are not the responsibility of any existing county department
    • Aerial photography
    • Drainage resources - FEMA, water structures, watersheds, etc.
    • Natural resources – State Parks, open space, nature preserves, etc.
    • Planimetrics – pavement, building footprints, etc.
    • Soils
    • Topography – LiDAR, contours, surface models
    • Road centerlines, trails, address points
    • Wetlands, water bodies, etc.

GIS Applications

  • Develop applications that are easy to use and intuitive
  • Produce applications that are cost effective both to develop and maintain
  • Ensure that the applications are secure
  • Provide applications that are relevant
  • Create applications that provide meaningful information that help users make informed decisions

Cooperative Opportunities

  • Work cooperatively with outside agencies, creating data sharing and other partnership arrangements for mutual benefit
  • Seek opportunities to promote/support studies and projects done by other agencies that benefit Lake County
  • Work cooperatively with neighboring counties to develop common standards for data we share with each other and with other agencies
  • Integrate spatial data from participating counties in Northeastern Illinois and Southeastern Wisconsin so it fits together precisely and carries core attributes that follow a common standard
  • Explore cooperative data development opportunities with other agencies, like regional aerial photography, LiDAR data, planimetrics, etc.

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Lake County, Illinois
18 N. County Street
Waukegan, IL 60085
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Phone 847.377.2373
Fax 847.984.5749
GIS and Mapping Division
18 N County St 6th Floor
Waukegan, IL 60085
Monday through Friday
8:30am - 5:00pm
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