The Illinois records that decide what a home really costs and what the seller has to tell you: disclosure law, property-tax reset, the official registry, and the FEMA flood map — sourced, with the county offices that hold the files.
Check the records behind the address before you offer.
Check any address — free previewThe legal standard: The seller must complete every item of the statutory Residential Real Property Disclosure Report and deliver it before a contract is signed, disclosing material defects known to the seller.
Illinois sellers must hand you the statutory Residential Real Property Disclosure Report before you sign a contract, answering specific questions including whether the property is in a floodplain, has had flooding or recurring basement or crawl-space leakage, and whether flood hazard insurance is carried. It covers material defects known to the seller, so it does not replace an inspection or a flood-map check.
Sources: ilga.gov · ilga.gov · opendocs.cookcountyil.gov · legalclarity.org · legalclarity.org · appealdesk.com
Buying does not reset your assessed value to the price you paid; values change on the county's quadrennial reassessment cycle (triennial in Cook County). Your first bills can still be higher than the seller's because exemptions are removed after a sale and only return once you apply for your own.
Homestead: The General Homestead Exemption reduces the equalized assessed value of your primary residence by up to $10,000 in Cook County, $8,000 in the collar counties (DuPage, Kane, Lake, McHenry, Will), and $6,000 elsewhere, provided you own and occupy the home as of January 1 and apply with your county assessor.
Illinois State Police Sex Offender Registry is run by Illinois State Police. Search it by the home's address before you offer — and search again before closing, because registry data changes as people move.
Open the official Illinois registry
You can also search every state at once through the federal National Sex Offender Public Website (NSOPW). A CurbFacts report shows the registry count for the home's ZIP — the same public data, organized for the decision.
The only flood map that decides a lender's insurance requirement is FEMA's — the National Flood Hazard Layer behind the official FEMA flood map viewer. Listing sites license private models that can and do disagree with it; when they conflict, the FEMA map is the one your lender and insurer use.
Check the exact parcel, not the ZIP code: flood-zone boundaries cut through streets, and two houses side by side can sit in different zones.
In Cook County, all exemptions are removed from a home one year after a sale is recorded, and the assessor does not grant the Homeowner Exemption automatically; if you do not file your own application, you pay without the exemption the seller enjoyed.
Cook County reassesses every three years by region (city, north suburbs, south and west suburbs) while the rest of Illinois reassesses every four years, so a large value jump can land in your first reassessment year after purchase rather than at closing.
What the Illinois disclosure does and does not cover, section by section, and the questions it never answers.
Read the guideHow to run an address through the official Illinois registry, and how to read what comes back.
Read the guideRecords live at the county level — assessor, recorder, permits. Pick the county for its records checklist.
Sourced registry counts and FBI-reported county crime for 1,182 ZIP codes in Illinois — the registry figure is each ZIP’s own; the crime record is its county’s, labeled as such. Every figure dated.
Every CurbFacts report pulls the public records behind an address — flood determination, registry, tax reset, price history, permits, and what's planned nearby — and shows its sources.
Check any address — free preview