- Accounting Tax & Computer Consultants, Rockford
- Accounting, Auditing & Bookkeeping Services, Rockford
- Additional Educational Opportunities, Rockford
- Administrative Organizations, Rockford
- Administrative Professionals, Rockford
- Adoption Agencies & Services, Rockford
- Adult & Geriatric Social Services, Rockford
- Adult Care Services, Rockford
- Adult Foster Care, Rockford
- Advertising Agencies, Rockford
- Advertising, PR & Marketing Services, Rockford
- Aerial Tours, Shows & Sports, Rockford
- Agricultural Insurance, Rockford
- Agriculture, Rockford
- Alterations & Tailors, Rockford
- Ambulance Department, Rockford
- American Legions, Rockford
- American Restaurants, Rockford
- Amusement Parks, Rockford
- Animal & Pet Food & Supplies Manufacturers, Rockford
- Animal Feeds, Rockford
- Animal Hospitals, Rockford - Veterinary Clinic & Hospital
- Animal Training, Rockford
- Animals, Rockford
- Antennas & Antenna Towers, Rockford
- Apartment Building Operators, Rockford
- Apartments & Buildings, Rockford
- Apparel Manufacturers, Rockford
- Appraisers, Rockford
- Aquariums & Aquarium Supplies, Rockford - Fish Tanks
- Architects, Rockford - Residential, Interior, Commercial, Office & Landscape Architecture Services
- Architectural Support Services, Rockford
- Arts & Crafts Supplies & Stores, Rockford
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- Arts & Culture, Rockford
- Asian Restaurants, Rockford
- Asphalt & Paving Materials, Rockford - Companies & Suppliers
- Asphalt Sealers, Rockford - Asphalt Sealcoating Companies
- Assisted Living & Elder Care Services, Rockford
- Assisted Living Facilities, Rockford
- Astrologers & Psychic Consultant, Etc, Rockford - Psychics & Mediums
- Athletic & Dance Shoes & Clothes, Rockford
- Athletic Equipment Rental, Rockford
- Athletic Equipment Repair & Service, Rockford
- Attorneys & Lawyers, Rockford
- Attorneys & Lawyers, Rockford
- ATV & RV Dealers, Rockford - All-Terrain & Recreational Vehicles
- Audio Video Repair & Service, Rockford
- Audio Visual Consultants, Rockford - Home Theater, Audio Video Consultants & More
- Audiologists, Rockford - Audiology Doctors, Physicians & Surgeons
- Auto & Truck Bodies & Equipment, Rockford
- Auto Alternators, Starters & Generators Repair & Rebuild, Rockford
- Auto Body Repair & Paint Shop, Rockford - Auto Body Shop
- Auto Customizing, Rockford
- Auto Electrical Repair & Service, Rockford
- Auto Glass, Rockford
- Auto Insurance, Rockford
- Auto Parts, Accessories, Equipment & Supplies, Rockford
- Auto Repair Shops & Maintenance Service, Rockford - Auto Mechanic & Car Repair Shops
- Auto Repair Shops - General, Rockford
- Auto Services, Rockford
- Auto Transmission, Rockford - Manual & Automatic Transmissions
- Auto, Car & Truck Accessories, Rockford
- Automation Systems & Conveying Systems & Equipment, Rockford
- Automation Systems & Equipment, Rockford - Industrial Automation
- Automobile Performance, Racing & Sports Car Equipment, Rockford
- Automotive Access & Equipment Manufacturers, Rockford
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