Illinois Business Entity Search
NAICS Association provides a full suite of tools to support your Illinois business search needs, including the NAICS company lookup (tool), our targeted business list builder or our suite of data enhancement and API tools.
Whether you’re enriching a CRM, identifying industry classifications, or building targeted business lists, our resources are designed to deliver reliable, actionable insights.
However, if you’re specifically looking to confirm whether a business is officially registered or exists in the state of Illinois, we encourage you to visit the official state portal at ilsos.gov for up-to-date entity registration information.
A Trusted Resource for Business Intelligence
Illinois is home to over Four Hundred Thousand Small Businesses. That’s a massive number of entities spanning every industry imaginable. Whether you’re researching competitors, verifying a vendor, or planning a market expansion—knowing how to conduct an accurate, efficient Illinois business search is critical.
That’s where NAICS Association comes in. As the leading source of business classification and data tools, we offer easy-to-use search capabilities that help professionals access the business insights they need.
Our Database has been cultivated to reflect Businesses that are established and have an active presence in the economy. This saves you from marketing to companies that only exist on paper to protect an asset like a boat or someone’s personal investments.
Why Use NAICS Association for an Illinois Business Search?
The Illinois business search tools available at NAICS.com offer far more than a basic name check. We provide access to vital company data like NAICS codes, SIC codes, industry classifications, and executive contacts—all within a few clicks. Whether you’re looking to qualify leads, vet companies, or enrich your CRM, we make the search process intuitive and comprehensive.
Reliable Data from a Trusted Source
Every piece of data we provide is backed by our proprietary algorithms and deep data sets. We’ve served government agencies, enterprise businesses, and startups alike. When you use our tools, you’re getting industry-trusted intelligence—something Google results just can’t compete with. The following are some useful stats on Marketable Businesses in Illinois.
A Snapshot of Illinois Businesses by NAICS Industry
| NAICS Codes | NAICS Description | # of Businesses |
|---|---|---|
| 11 | Agriculture, Forestry, Fishing and Hunting | 11,059 |
| 21 | Mining | 393 |
| 22 | Utilities | 1,003 |
| 23 | Construction | 39,737 |
| 31-33 | Manufacturing | 20,391 |
| 42 | Wholesale Trade | 20,046 |
| 44-45 | Retail Trade | 49,744 |
| 48-49 | Transportation and Warehousing | 26,550 |
| 51 | Information | 9,791 |
| 52 | Finance and Insurance | 22,816 |
| 53 | Real Estate Rental and Leasing | 21,066 |
| NAICS Codes | NAICS Description | # of Businesses |
|---|---|---|
| 54 | Professional, Scientific, and Technical Services | 65,187 |
| 55 | Management of Companies and Enterprises | 1,539 |
| 56 | Administrative and Support and Waste … | 36,724 |
| 61 | Educational Services | 13,325 |
| 62 | Health Care and Social Assistance | 45,328 |
| 71 | Arts, Entertainment, and Recreation | 11,020 |
| 72 | Accommodation and Food Services | 28,541 |
| 81 | Other Services (except Public Administration) | 58,235 |
| 92 | Public Administration | 6,571 |
| Grand Total | 489,066 |
A Snapshot of Illinois Businesses by Annual Sales
| Annual Sales Ranges | # of Businesses |
|---|---|
| Uncoded records | 58,305 |
| Under 200,000 | 304,796 |
| 200,001 – 499,999 | 63,147 |
| 500,000 – 999,999 | 24,371 |
| 1,000,000 – 2,499,999 | 17,700 |
| 2,500,000 – 4,999,999 | 7,718 |
| 5,000,000 – 9,999,999 | 5,264 |
| 10,000,000 – 99,999,999 | 6,595 |
| 100,000,000 – 499,999,999 | 835 |
| 500,000,000 – 999,999,999 | 132 |
| 1,000,000,000+ | 203 |
| Total | 489,066 |
A Snapshot of Illinois by Unique Characteristics
| Unique Segments | # of Businesses |
|---|---|
| Single Location Businesses – US | 423,396 |
| Headquarter Locations – US | 18,925 |
| Branch Locations – US | 58,390 |
| Business with Websites | 264,730 |
| Opt-In Business Emails | 100,252 |
| Privately-Held Businesses | 475,790 |
| Publicly-Held Businesses | 14,536 |
| Woman-Owned Businesses | 33,475 |
| Minority-Owned Businesses | 8,018 |
| Veteran-Owned Businesses | 1,871 |
| Independent Franchisees | 22,010 |
Want to learn more about these companies or acquire a marketing list? Click here to request a custom report or a list of businesses.
What Can You Find in an Illinois Business Entity Search?
Our Illinois Business Entity Search capabilities go beyond names and addresses. (Using our Company Lookup Tool) you can identify:
- Verified business names and aliases
- NAICS and SIC classifications
- Contact information for key executives
- Revenue estimates and employee count
- Geographic business location
This depth of insight is perfect for sales prospecting, compliance verification, or business development research.
How to Use the NAICS Illinois Business Search Tool
The process is simple. From the Company Lookup Page on our site, you can input the business name, address, and phone info – and you’re off and running. This tool will identify a particular company’s NAICS Codes and other firmographic data. You can even perform a targeted code search by NAICS or SIC number if you know the line of business already.
Best Use Cases for Illinois Business Search
- Consultants & Analysts: Validate business information quickly for reports or audits.
- Marketers: Enrich CRM records and improve segmentation with verified data.
- B2B Sales Teams: Build targeted lead lists by filtering Illinois businesses by industry and size.
- Procurement Professionals: Vet suppliers for compliance and operational scale.
Take the Next Step with NAICS Association
Need deeper business insights for your project, CRM, or prospect list? Our suite of tools is built to make business research faster, easier, and more accurate. Start with a simple search to find the information you need. You can perform a targeted code search, use our company lookup tool, or explore industries via NAICS codes by industry.
Need help? Our NAICS identification help team and SIC lookup help resources are standing by. Get started today with NAICS Association—your trusted partner in business data.
Frequently Asked Questions
What is an Illinois Business Search?
An Illinois Business Search is a process of looking up verified company data for businesses operating in Illinois. This can include names, industry classifications, executive contacts, and operational status.
How accurate is the data from NAICS Association?
NAICS Association data is highly accurate and frequently updated. We source information from trusted databases, regulatory filings, and proprietary verification processes.
Can I look up companies by industry?
Yes, you can use our Search NAICS Codes by Industry tool to find companies in a specific sector across Illinois or any state.
What are NAICS codes?
NAICS codes are classification numbers used by the federal government to organize and track business industries. They’re essential for data analysis, regulatory compliance, and business strategy.
How do SIC codes differ from NAICS codes?
SIC codes are an older classification system still in use by many legacy systems. While NAICS codes offer more modern, detailed categorization, SIC codes remain relevant in insurance, banking, and historical data sets.
How do I find a company’s NAICS code?
You can find a company’s NAICS code by using our Company Lookup Tool. Simply enter the business name to see its classifications and more.
What if I need help identifying the right code?
If you’re not sure which code fits your business, use our NAICS Identification Help tool for expert guidance.