Name and Register a Business in Illinois
Official Illinois business links and the industries with the most locations in the state.
Official Illinois business registration links
- Registration, Licenses, and Permits
- Secretary of State
- Illinois Department of Revenue - Businesses
- Department of Employment Security
- Illinois state website
- Illinois - Business
- Step-by-Step Guide to Starting a Business in Illinois
- Illinois Department of Commerce and Economic Opportunity
- New Hire Registry
- Small Business Administration - Illinois
- State Agency List
- Selling to the State of Illinois
- Illinois Compiled Statutes
Official state agency links as listed by the IRS on its Illinois state links page. Filing fees and steps change, so confirm current requirements with the agency before you file.
Industries with the most locations in Illinois
- Limited-Service Restaurants (10,604)
- Full-Service Restaurants (9,899)
- General Freight Trucking, Long-Distance, Truckload (7,100)
- Offices of Lawyers (7,070)
- Religious Organizations (6,991)
- Offices of Physicians (except Mental Health Specialists) (6,511)
- Residential Remodelers (6,259)
- Offices of Dentists (5,857)
- Insurance Agencies and Brokerages (5,855)
- Landscaping Services (5,027)
- Offices of Real Estate Agents and Brokers (4,936)
- General Freight Trucking, Local (4,678)
- Plumbing, Heating, and Air-Conditioning Contractors (4,156)
- General Automotive Repair (3,923)
- Commercial Banking (3,781)
- Administrative Management and General Management Consulting Services (3,672)
- Gasoline Stations with Convenience Stores (3,480)
- Beauty Salons (3,325)
- Child Day Care Services (3,104)
- Drinking Places (Alcoholic Beverages) (2,870)
- Custom Computer Programming Services (2,853)
- Electrical Contractors and Other Wiring Installation Contractors (2,715)
- Janitorial Services (2,555)
- Supermarkets and Other Grocery (except Convenience) Stores (2,478)
- Snack and Nonalcoholic Beverage Bars (2,398)
- Offices of Physical, Occupational and Speech Therapists, and Audiologists (2,390)
- Computer Systems Design Services (2,308)
- Offices of Mental Health Practitioners (except Physicians) (2,303)
- Offices of Certified Public Accountants (2,269)
- Portfolio Management (2,119)
- Lessors of Residential Buildings and Dwellings (1,905)
- Marketing Consulting Services (1,879)
- Specialized Freight (except Used Goods) Trucking, Local (1,871)
- Corporate, Subsidiary, and Regional Managing Offices (1,827)
- Offices of Chiropractors (1,825)
- Engineering Services (1,763)
- Other Accounting Services (1,727)
- Electronic Shopping and Mail-Order Houses (1,686)
- All Other General Merchandise Stores (1,634)
- Fitness and Recreational Sports Centers (1,632)
- Temporary Help Services (1,588)
- Pharmacies and Drug Stores (1,577)
- All Other Specialty Trade Contractors (1,555)
- Wholesale Trade Agents and Brokers (1,542)
- Automotive Body, Paint, and Interior Repair and Maintenance (1,533)
- Hotels (except Casino Hotels) and Motels (1,498)
- Painting and Wall Covering Contractors (1,490)
- Residential Property Managers (1,487)
- Beer, Wine, and Liquor Stores (1,468)
Location counts: U.S. Census Bureau, County Business Patterns 2022.
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