Illinois County Zoning Enabling Act (IL)

Tracked preemption from the Illinois overlay bundle.

Overview

Effective
1961-07-01
Sunset
Authority
state
Scope
state:IL

Trigger predicate

When this evaluates true for a parcel, the law's preempted fields take precedence over base zoning.

parcel.in_unincorporated_county == True

Preempted fields

2 fields on the base district schema are rewritten when the trigger fires.

FieldOpValueNote
zoning_authorityoverridecountyCounty zoning applies only to unincorporated territory; municipal zoning supersedes upon annexation/incorporation
amendment_supermajority_required_pctfloor_at75§5-12009.5 supermajority-override vote on ZBA-recommended amendments

Citation

Authority source
55 ILCS 5/5-12001 through 5/5-12019
§ 55 ILCS 5/5-12001 et seq.
https://www.ilga.gov/legislation/ilcs/ilcs4.asp?DocName=005500050HArt%2E+5+Div%2E+12

Research notes

Counties zone unincorporated territory only. County zoning authority stops at municipal boundaries. Cook, DuPage, Kane, Lake, Will, McHenry counties have specific frameworks. Cook County zoning applies only to ~2% unincorporated land.