Before you offer on a home in Illinois, run its address through the official registry: the Illinois State Police Sex Offender Registry, run by Illinois State Police. It is free, it takes two minutes, and it is the check listing sites never do for you.
Run the check
Check the records behind the address before you offer.
Check any address — free preview1. Open the official Illinois registry. 2. Search by the home's street address (a radius or map search works best). 3. Note the counts within a quarter mile, a half mile, and a mile — distance bands tell you more than a single pin. 4. Repeat the search the week you close. Registries update as people move and register new addresses.
Can you get an exact count in Illinois?
Yes — Illinois's official search returns an exact count for a ZIP, city or radius, so you can put a number on the address before you offer.
How it works: After the disclaimer, ISP search filters by name, city, ZIP code or county (plus a neighborhood map); a ZIP search returns a countable list.
Worth knowing: NSOPW URL redirects to sor.isp.illinois.gov, which 403s automated fetch; ISP search fields (city/ZIP/county) are documented in current search-result evidence describing the live form.
Method checked against the NSOPW state directory on 2026-11-04.
How to read what comes back
Treat the addresses as reported addresses: the system depends on registrants reporting moves and on agencies processing them, so the map is a strong signal, not a guarantee. Judge the pattern around the address — how many, how close, typical for the area or an outlier — and remember the registry lists only people required to register; it is not a crime map.
Check the records behind the address before you offer.
Check any address — free previewHow CurbFacts uses this data
A CurbFacts report summarizes the same public registry data as ZIP-level counts for the address — never offender names or photos. The full Illinois records guide and the Illinois disclosure guide cover the rest of the record file.
Frequently asked questions
Can I get an exact registrant count for a Illinois address?
Yes. After the disclaimer, ISP search filters by name, city, ZIP code or county (plus a neighborhood map); a ZIP search returns a countable list.
Who runs the Illinois registry?
The Illinois State Police — the official search is the Illinois State Police Sex Offender Registry. It is free; if a site asks you to pay for registry results, you are on a data broker.
Does a CurbFacts report show offender names or photos?
No. Reports show the count of registrants in the home's ZIP from state registry data, and link you to the official registry if you want the underlying public record.
Sources: ilga.gov · opendocs.cookcountyil.gov · legalclarity.org · appealdesk.com
See what the listing doesn't say.
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