---
title: "Check Illinois — Public Records Search Platform"
description: "A consumer-facing public records search platform letting users find contact information, criminal arrest records, property data, and more across 26M+ searchable Illinois records."
canonical_url: "https://mercurystk.com/completed-work/check-illinois-consumer-search"
last_updated: "2026-06-29T04:31:10.354Z"
---

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## Overview

**Check Illinois** is a consumer-facing public records search product that lets
anyone find contact information, criminal arrest records, property and mortgage
details, foreclosures, and more across **millions of Illinois public records**.
Users search by name, phone, PIN, business name, or street address and get
results instantly on screen.

The platform is built on top of a database containing **tens of millions of
records** compiled from Illinois county, state, and federal public-record sources,
spanning 17 counties including Cook, DuPage, Kane, Lake, and Will.

## What it does

Behind a simple search box sits a large, continuously-updated data platform. The
product had to make millions of records searchable in seconds, organize them into
clear categories, and support paying corporate subscribers — all while staying
compliant with public-records regulations.

## Working with millions of records

The core engineering challenge here is **scale and searchability**: ingesting and
indexing tens of millions of records across many categories (mortgage, real
estate, criminal, misdemeanor, bankruptcies, foreclosures, tax liens, DUI,
divorces, probate, business licenses, and more) and returning accurate matches in
under two minutes per search.

## Results