Lake County, Illinois

Public GIS Data

Political Boundaries

NOTE: CAD users, these datasets are optimized for use with GIS software. CAD software such as AutoCAD or MicroStation may not be able to open these datasets.

County Board Districts

Update Frequency

As needed. Boundaries are updated as the underlying tax parcels are adjusted or as a result of legislation.

Description

Lake County is governed by the 21 elected members of the County Board each representing a single district.

Downloads

Esri Shapefile 1.2 MB

Judicial Circuit Court Subcircuits

Update Frequency

As needed. Boundaries are updated as the underlying tax parcels are adjusted or as a result of legislation.

Description

Boundaries for the 19th Judicial Circuit Court subcircuits.

Downloads

Esri Shapefile 1.2 MB

Lake County Boundary

Update Frequency

As needed. Boundaries are updated as the underlying tax parcels are adjusted or as a result of legislation.

Description

This is our working version of the Lake County boundary. Although technically the county's eastern border extends eastward into Lake Michigan to the state line where Illinois meets Michigan, we routinely use the Lake Michigan shoreline as our eastern boundary for mapping purposes. The north, west and south boundaries are based on a compilation of survey data which aligns well, but not perfectly, with the border as mapped by neighboring counties and the State of Wisconsin, which forms the northern boundary of the county.

Downloads

Esri Shapefile 1.2 MB

Political Townships

Update Frequency

Weekly. Boundaries are updated as the underlying tax parcels are adjusted or as a result of annexations.

Description

Political townships are those with elected officials - township supervisor, assessor, road commissioner, etc. However, Zion Township is uniquely defined in law as being coterminous with the City of Zion. Since the city can and does annex additional land, whenever it does so the boundary of Zion Township also changes to match it.

Downloads

Esri Shapefile 1.3 MB

State Representative Districts

Update Frequency

Weekly. Boundaries are updated as the underlying tax parcels are adjusted or as a result of annexations.

Description

Boundaries for electing representatives to the Illinois House as established by that body.

Downloads

Esri Shapefile 1.2 MB

State Senate Districts

Update Frequency

Weekly. Boundaries are updated as the underlying tax parcels are adjusted or as a result of annexations.

Description

Boundaries for electing senators to the Illinois Senate as established by that body.

Downloads

Esri Shapefile 1.2 MB

U.S. Congressional Districts

Update Frequency

Weekly. Boundaries are updated as the underlying tax parcels are adjusted or as a result of annexations.

Description

Boundaries for representatives to the U.S. House of Representatives as established by that body.

Downloads

Esri Shapefile 1.2 MB

Voting Precincts

Update Frequency

As needed. Boundaries are updated as the underlying tax parcels are adjusted or as needed after approval by the County Board. Contact the office of the Lake County Clerk at (847) 377-2400 for current information.

Description

Registered voters are assigned to individual precincts and cast their votes at the designated polling place for the precinct. These boundaries are proposed by the County Clerk and approved by the County Board following provisions of Illinois State Statutes. Precinct boundaries can be changed as needed to achieve objectives such as balancing the number of voters among precincts and minimizing the number of ballot styles representing unique combinations of elective districts in a precinct and for other purposes established by law.

Downloads

Esri Shapefile 3.0 MB