Property tax · Illinois
Property tax in Illinois
Property tax (County assessors) data for ZIP codes in Illinois. Pick a ZIP below to dive into the property tax summary.
Last verified 2026-05-13 · methodology
What lands here
Pages show the county millage rate, assessment methodology, homestead and senior exemptions, and a link to the assessor's portal for address-specific searches.
Source & refresh
County assessors. Refreshed annual reassessment per county. Primary source →
Illinois top concern
Lead service lines, flooding (Mississippi/Illinois)
Illinois has the highest LCRR lead-service-line replacement obligations in the US (Chicago alone >400,000 LSLs). FEMA AE coverage extends along the Mississippi, Illinois, and Rock rivers. EPA SDWIS shows urban vs. downstate disparity.
See Illinois state page for the full state-level rollup across all 12 dimensions.
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The 2024 Lead and Copper Rule Revisions (LCRR) require every US community water system to inventory and report lead service lines. Plain-English guide.
Property tax millage — what 'mill' means and how your bill is computed
Plain-English guide to property tax millage rates, assessment ratios, and homestead exemptions. How county assessors compute your annual property tax bill.
School district boundaries — how to confirm yours and why it matters
How school district boundaries work, where to find them, and why the same street can split between two districts.
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Plain-English guide to county deed records: what gets filed, how to look up a property's history, and why zipradar aggregates only counts (never owner names).
8 Illinois ZIPs
ZIP 60601
Chicago, IL
Property tax →
ZIP 60614
Chicago (Lincoln Park), IL
Property tax →
ZIP 61602
Peoria, IL
Property tax →
ZIP 60302
Oak Park, IL
Property tax →
ZIP 60611
Chicago (Streeterville), IL
Property tax →
ZIP 61820
Champaign, IL
Property tax →
ZIP 60201
Evanston (IL), IL
Property tax →
ZIP 60515
Downers Grove, IL
Property tax →