All States/

Illinois Business Entity Search

Search Illinois LLCs, corporations, and partnerships via API. Structured JSON from IRS Exempt Organizations Business Master File. 337,092 entities available.

337,092
Total Entities
107,086
Corporations
72,000
Nonprofits
33,175
LLCs

Search Illinois entities

Entity types in Illinois

Corporation
107,086Nonprofit
72,000LLC
33,175FCC Licensee
24,129Cosmo
23,125Pharmacy
21,159Roofing Contractor
20,861Prof Service Corp
13,250Medical Corp
12,746Design Firm
9,561

Related Guides

How to Look Up a Business in Any StateHow to Verify if a Business is Legitimate

Get Illinois business data via API

Developer plan includes a 14-day free trial. Cancel anytime.

Start Free Trial