- Cabinets & Cabinet Hardware, Janesville
- Cabins Cottages & Chalet Rental, Janesville
- Cable TV Companies & Services, Janesville
- Cafe Restaurants, Janesville
- Camper, Rvs & Travel Trailer Dealers, Janesville
- Campgrounds, Janesville
- Cancer Clinics, Janesville - Cancer Treatment Centers
- Candy Manufacturers, Janesville
- Candy, Nut & Confectionery Wholesale & Retail, Janesville - Candy Stores
- Canvas Goods & Products, Janesville
- Captioning Services, Janesville
- Car Alarms & Security Systems, Janesville - Remote Car Starter, etc
- Car Detailing & Wash Service, Janesville - Auto Detailing
- Car Rental, Janesville - Rental Cars & Lease Service
- Car Tune Up Service, Janesville - Auto Tune Up
- Car Wash, Cleaning, Wax & Polish Service, Janesville
- Cardiologists, Janesville - Heart Doctors, Physicians & Surgeons (Cardiology)
- Carnivals, Fairs & Exhibitions, Janesville
- Carpenters, Janesville - Carpentry Contractors
- Carpet & Carpet Equipment & Supplies Dealers, Janesville
- Carpet & Rug Cleaners Water Extraction & Restoration, Janesville
- Carpet Rug & Upholstery Cleaners, Janesville
- Carpet, Rug & Linoleum Flooring Dealers, Janesville
- Cars, Truck, Van & SUV Car Dealerships, Janesville - Auto Dealers
- Cartage Truck Line, Janesville
- Casual Dining Restaurants, Janesville
- Caterers Food Services, Janesville
- Catholic Churches, Janesville
- Ceiling Materials, Janesville
- Cellular & Mobile Phone Equipment & Systems Installation, Repair & Service, Janesville
- Cellular & Mobile Phone Service, Janesville
- Cemetery Subdividers & Developers, Janesville
- Central American Restaurants, Janesville
- Ceramic Equipment & Supplies, Janesville
- Charitable & Non-Profit Organizations, Janesville
- Check Cashing Services, Janesville
- Cheese Products, Janesville - Cheese Shops
- Chemical Manufacturers, Janesville
- Chemical Product Manufacturers, Janesville
- Chemical Products, Janesville - Chemical Distributors, Dealers, Wholesale, etc
- Chemicals & Related Products, Janesville
- Chemicals Agricultural, Janesville
- Chicken Restaurants, Janesville
- Child Care & Day Care Services, Janesville
- Child Related Social Services, Janesville
- Children & Family Entertainment, Janesville
- Children's Clothing Stores, Janesville - Infant, Babies & Kids Clothing
- Chinese Restaurants, Janesville
- Chiropractic Clinics, Janesville
- Chiropractic Information & Referral Services, Janesville - Educational, Referral & Support Service Centers
- Chiropractor, Janesville
- Christian Churches, Janesville
- Church Of Christ, Janesville
- Church Of Jesus Christ Of Latter Day Saints, Janesville
- Church Of The Nazarene, Janesville
- Churches 1 Of 3, Janesville
- Churches 2 Of 3, Janesville
- Churches 3 Of 3, Janesville
- Churches Christian Science, Janesville
- Cigar, Cigarette & Tobacco Store & Supplies, Janesville
- City & County Administrative Agencies, Janesville
- City & County Government, Janesville
- City & County Law Enforcement, Janesville
- Cleaning & Maintenance Services, Janesville
- Cleaning & Restoration Contractors, Including Sandblasting, Janesville
- Cleaning Supplies & Products, Janesville
- Cleaning Supplies, Systems & Equipment, Janesville - Janitorial Supplies
- Clergy, Janesville
- Clinics, Janesville
- Clock Repair, Janesville
- Clocks Retail, Janesville
- Clothesline Equipment & Supplies, Janesville - Washing Line - Companies
- Clothing & Accessories Resale & Consignment Shops, Janesville
- Clothing Stores, Janesville - Clothes & Accessories
- Clubs - Private, Janesville
- Clutches, Janesville
- Clutches & Facings, Janesville
- CNC Machine Shop, Janesville
- Coaching Business & Personal, Janesville
- Cocktail Lounges, Janesville
- Coffee, Janesville
- Coffee & Tea - Wholesale, Janesville
- Coffee & Tea Stores, Janesville
- Coffee, Espresso & Tea House Restaurants, Janesville
- Coin Dealers & Supplies , Janesville
- Coin Operated Machines & Equipment, Janesville
- Collectibles, Janesville
- Collection Agency Services, Janesville
- Colleges & Universities, Janesville
- Commercial & Industrial Photographers, Janesville
- Commercial Equipment, Janesville
- Commercial Printing, Janesville
- Commercial Printing Manufacturers, Janesville
- Commercial, Industrial & Office Space for Rent & Lease, Janesville
- Commodity & Merchandise Storage & Warehouse, Janesville - Warehousing
- Communication Equipment & Systems, Janesville
- Communications Consultants, Janesville
- Communications Contractors, Janesville
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- Communications Services, Janesville
- Community & Recreational Facilities, Janesville
- Community Centers, Janesville
- Community Church, Janesville
- Community Churches, Janesville
- Community Services, Janesville
- Computer & Audio Visual Services, Janesville
- Computer & Laptop Repair, Janesville - PC Repair Services
- Computer & Software Stores, Janesville
- Computer Cable & Wire Installation, Janesville
- Computer Networks, Janesville - Design & Systems
- Computer Programming & Software Development Services, Janesville
- Computer Repair, Janesville
- Computer Room - Installation & Equipment, Janesville
- Computer Services, Janesville
- Computer Software & Services, Janesville
- Computer Software Service, Janesville
- Computer Stores, Janesville
- Computer Stores - Other, Janesville
- Computer Supplies, Parts, Equipments & Accessories, Janesville
- Computer Support & Help Services, Janesville
- Computer System Consultants, Janesville - IT Consulting Services
- Computer System Designers & Consultants, Janesville
- Computer Technical Assistance & Support Services, Janesville - Tech Support Service
- Computer Training Schools, Janesville
- Computers Dealers Used & Refurbished, Janesville
- Concrete, Janesville - Cement & Concrete Products, Suppliers, Companies
- Concrete & Cement, Janesville
- Concrete & Pumice Bricks, Janesville
- Concrete Contractors, Janesville - Concrete Construction & Concrete Companies
- Concrete Handling Services, Janesville - Concrete Pumping
- Concrete Product Manufacturers, Janesville
- Concrete Repair, Restoration, Sealing & Cleaning, Janesville
- Condiments & Sauces, Janesville
- Condominiums & Townhomes for Rent, Janesville - Townhouses & Condos for Rent & Lease
- Congregational Church, Janesville
- Congressional Representatives, Janesville
- Construction, Janesville
- Construction Companies, Janesville
- Construction Equipment Rental & Leasing, Janesville
- Construction Services, Janesville
- Consultants & Services, Janesville
- Consultants Referral Service, Janesville
- Consulting Services, Janesville - Internet Consultants
- Contact Lenses, Janesville
- Contractor Equipment & Supplies, Janesville - Construction Equipment & Machinery
- Contractors Equipment & Supplies Manufacturers, Janesville
- Contractors Equipment & Supplies - Rental & Leasing, Janesville
- Contractors Supplies & Equipment, Janesville
- Convalescent Homes Placement Services, Janesville - Convalescent Care
- Convenience Stores, Janesville
- Convention & Meeting Facilities, Janesville - Meeting Rooms
- Convention & Visitor Information & Bureaus, Janesville - Tourist Information Centers
- Convention Services - Other, Janesville
- Cooking Services, Janesville
- Cooking, Food & Beverage Equipment, Janesville
- Cookware & Cooking Utensils Stores, Janesville
- Cooling System & Parts, Janesville - Antifreeze, Radiator, Water Pump, Fan, Hoses, Belts, etc
- Copier & Copy Machine Sales, Supplies, Service & Repair, Janesville
- Copier & Copy Machine Supplies, Equipment & Parts, Janesville
- Copying & Duplicating Services, Janesville
- Coroners, Janesville
- Corporate Attorneys & Lawyers, Janesville
- Corporate Business Attorneys & Lawyers, Janesville
- Corporate Lawyers & Attorneys, Janesville
- Cosmetics, Janesville
- Cosmetics & Perfumes Outlets, Janesville
- Cosmetics, Toiletries, Perfumes & Beauty Supply Stores, Janesville
- Cosmetology School, Janesville
- Costume Jewelry, Janesville
- Costume Sales & Rental, Janesville
- Counseling Professionals, Janesville
- Counseling Services, Janesville
- Country Clubs, Janesville
- Country Cooking Restaurants, Janesville
- County Police, Janesville
- Court Reporter , Janesville - Stenographer & Convention Reporters
- Craft Supplies, Janesville - Hobby & Craft Stores
- Crane Rental & Leasing, Janesville
- Crane Services, Janesville
- Cranes & Derricks, Janesville
- Cranes Hoisting & Rigging Service, Janesville - Crane Rental Service
- Credit & Debt Counseling Services, Janesville
- Credit Card Plan Services, Janesville
- Credit Unions, Janesville
- Cremation Services, Supplies & Equipment, Janesville
- Criminal Attorneys & Lawyers, Janesville
- Criminal Defense Attorneys & Lawyers, Janesville
- Criminal Defense Lawyers & Attorneys, Janesville
- Critical & Emergency Care Doctors, Janesville - Intensive Care Doctors, Physicians & Surgeons
- Cruise Agents, Janesville - Travel Agents
- Cruise Lines, Janesville - Cruises
- Crushed Stone & Rock, Janesville - Crushed Granite, Concrete, Gravel, etc
- Custom Furniture, Janesville - Furniture Designers & Custom Builders
- Custom Made Boots & Shoes, Janesville
- Custom Parts & Accessories, Janesville
- Custom Sewing & Alterations, Janesville
- Customer Service Representatives, Janesville
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