- Cabinets & Cabinet Hardware, Alton
- Cabinets Refacing, Refinishing & Building, Alton - Kitchen, Bathroom, Medicine, Storage & Custom Cabinets Contractors
- Cafe Restaurants, Alton
- Cajun & Creole Restaurant, Alton
- Campgrounds, Alton
- Car Alarms & Security Systems, Alton - Remote Car Starter, etc
- Car Detailing & Wash Service, Alton - Auto Detailing
- Car Rental, Alton - Rental Cars & Lease Service
- Car Tune Up Service, Alton - Auto Tune Up
- Car Wash, Cleaning, Wax & Polish Service, Alton
- Card & Game Rooms & Services, Alton
- Career & Vocational Counseling, Alton
- Carpenters, Alton - Carpentry Contractors
- Carpet, Rug & Linoleum Flooring Dealers, Alton
- Cars, Truck, Van & SUV Car Dealerships, Alton - Auto Dealers
- Casual Dining Restaurants, Alton
- Caterers Food Services, Alton
- Catholic Churches, Alton
- Cellular & Mobile Phone Equipment & Systems Installation, Repair & Service, Alton
- Cellular & Mobile Phone Service, Alton
- Central American Restaurants, Alton
- Charitable & Non-Profit Organizations, Alton
- Check Cashing Services, Alton
- Chemicals & Related Products, Alton
- Chicken Restaurants, Alton
- Child Care & Day Care Services, Alton
- Child Related Social Services, Alton
- Children's Clothing Stores, Alton - Infant, Babies & Kids Clothing
- Chimney & Fireplace Construction Contractors, Alton - Installation, Cleaning & Repair Services
- Chimney Cleaning & Repair, Alton - Fireplace - Chimney Sweep Services
- Chinese Restaurants, Alton
- Chiropractic Clinics, Alton
- Chiropractor, Alton
- Christian Churches, Alton
- Church Of Christ, Alton
- Church Of God, Alton
- Churches 1 Of 3, Alton
- Churches 2 Of 3, Alton
- Churches 3 Of 3, Alton
- Churches Christian Science, Alton
- Churches Seventh Day Adventist, Alton
- Cigar, Cigarette & Tobacco Store & Supplies, Alton
- City & County Administrative Agencies, Alton
- City & County Government, Alton
- Cleaning & Maintenance Services, Alton
- Cleaning Supplies, Systems & Equipment, Alton - Janitorial Supplies
- Clinics, Alton
- Clothing Stores, Alton - Clothes & Accessories
- CNC Machine Shop, Alton
- Coal & Coke, Alton
- Cocktail Lounges, Alton
- Coin Operated Amusement Devices, Alton
- Coin Operated Machines & Equipment, Alton
- Colleges & Universities, Alton
- Commercial & Industrial Laundry, Alton
- Commercial Equipment, Alton
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- Commercial Printing, Alton
- Commercial Printing Manufacturers, Alton
- Communication Equipment & Systems, Alton
- Communications Consultants, Alton
- Communications Services, Alton
- Community & Recreational Facilities, Alton
- Community Church, Alton
- Community Churches, Alton
- Community Services, Alton
- Computer & Audio Visual Services, Alton
- Computer & Equipment Rental & Leasing, Alton
- Computer & Laptop Repair, Alton - PC Repair Services
- Computer & Software Stores, Alton
- Computer Repair, Alton
- Computer Services, Alton
- Computer Software & Services, Alton
- Computer Software Service, Alton
- Computer System Consultants, Alton - IT Consulting Services
- Computer System Designers & Consultants, Alton
- Concrete, Alton - Cement & Concrete Products, Suppliers, Companies
- Concrete & Cement, Alton
- Concrete Construction Forms & Accessories, Alton
- Concrete Contractors, Alton - Concrete Construction & Concrete Companies
- Concrete Product Manufacturers, Alton
- Condiments & Sauces, Alton
- Construction, Alton
- Construction & Civil Engineer, Alton
- Construction Services, Alton
- Consultants & Services, Alton
- Contact Lenses, Alton
- Convenience Stores, Alton
- Convention & Meeting Facilities, Alton - Meeting Rooms
- Convention & Visitor Information & Bureaus, Alton - Tourist Information Centers
- Convention Services - Other, Alton
- Cookies, Alton
- Cooking, Food & Beverage Equipment, Alton
- Cooling System & Parts, Alton - Antifreeze, Radiator, Water Pump, Fan, Hoses, Belts, etc
- Copier & Copy Machine Sales, Supplies, Service & Repair, Alton
- Copying & Duplicating Services, Alton
- Cosmetics, Alton
- Cosmetics & Perfumes Outlets, Alton
- Cosmetics, Toiletries, Perfumes & Beauty Supply Stores, Alton
- Counseling Behavioral, Alton
- Counseling Services, Alton
- Coverall Supplies & Services, Alton
- Crab House Restaurants, Alton
- Craft Supplies, Alton - Hobby & Craft Stores
- Credit & Debt Counseling Services, Alton
- Credit Unions, Alton
- Cremation Services, Supplies & Equipment, Alton
- Criminal Attorneys & Lawyers, Alton
- Criminal Defense Attorneys & Lawyers, Alton
- Criminal Defense Lawyers & Attorneys, Alton
- Cruise Agents, Alton - Travel Agents
- Cruise Lines, Alton - Cruises
- Custom Parts & Accessories, Alton
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