Illinois Business Entity Search

Search Illinois LLCs, corporations, and partnerships via API. Structured JSON from IRS Exempt Organizations Business Master File. 254,152 entities available.

254,152

Total Entities

107,084

Corporations

72,000

Nonprofits

33,175

LLCs

Search Illinois entities

Entity types in Illinois

107,084 Nonprofit

33,175 FCC Licensee

24,129 Non-Profit

6,517 Sole Proprietorship

5,062 Business Entity

2,398 Partnership

1,033 State Non-Member Bank

Related Guides

How to Look Up a Business in Any State How 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