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First Stop Business Information Center's searchable inventory of business requirements and resources.
Starting Your Business in Illinois Handbook (PDF English / Spanish)
Small Business Resources
Licenses / Registrations
Search Illinois Business Requirements
Illinois Department of Revenue
Tax Information for Small Construction Businesses
Census and Market Data / Community Profile
Sources of Financing
City of Chicago - Business Affairs and Consumer Protection (BACP)
Illinois Department Employment Security – Employers
Illinois On-Site Safety and Health Consultation Program, IL Dept of Labor