Illinois SB 4206: LOC GOVT-DATA CENTER

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104TH GENERAL ASSEMBLY 
State of Illinois 
2025 and 2026
SB4206

Introduced 5/18/2026, by Sen. Darby A. Hills 

SYNOPSIS AS INTRODUCED:

55 ILCS 5/5-12025 new

65 ILCS 5/11-13-30 new

 Amends the Counties Code. Allows a county to establish standards for the construction of data centers by ordinance. Provides that the standards may include, without limitation, the size, height, and design of structures and the number of facilities that may be located within a geographic area. Provides that a county may regulate the siting of data centers in unincorporated areas of the county outside of the zoning jurisdiction of a municipality and the 1.5-mile radius surrounding the zoning jurisdiction of a municipality and may establish other specified standards. Sets forth provisions concerning notice and hearings. Provides that any provision of a county zoning ordinance pertaining to data centers that is in effect prior to the effective date may remain in effect. Amends the Illinois Municipal Code. Provides that a municipality may, by ordinance, regulate the siting of data centers within the municipality's zoning jurisdiction and within the 1.5-mile radius surrounding its zoning jurisdiction and may establish other specified standards. Sets forth provisions concerning notice and hearings.

LRB104 21947 TRT 37880 b

A BILL FOR

SB4206LRB104 21947 TRT 37880 b

1 AN ACT concerning local government.

2 Be it enacted by the People of the State of Illinois, 

3represented in the General Assembly:

4 Section 5. The Counties Code is amended by adding Section 

55-12025 as follows:

6 (55 ILCS 5/5-12025 new)

7 Sec. 5-12025. Data centers.

8 (a) For the purposes of this Section, "data center" means 

9a facility: (1) whose primary services are the storage,