- Cable TV Companies & Services, Katonah
- Cafe Restaurants, Katonah
- Candy, Nut & Confectionery Wholesale & Retail, Katonah - Candy Stores
- Carpenters, Katonah - Carpentry Contractors
- Carpet Rug & Upholstery Cleaners, Katonah
- Carpet, Rug & Linoleum Flooring Dealers, Katonah
- Casual Dining Restaurants, Katonah
- Caterers Food Services, Katonah
- Catholic Churches, Katonah
- Charitable & Non-Profit Organizations, Katonah
- Child Care & Day Care Services, Katonah
- Children's Clothing Stores, Katonah - Infant, Babies & Kids Clothing
- Chimney & Chimney Lining Material, Katonah
- Chimney & Fireplace Construction Contractors, Katonah - Installation, Cleaning & Repair Services
- Chimney Builders & Repairers Commercial & Industrial, Katonah
- Chimney Cleaning & Repair, Katonah - Fireplace - Chimney Sweep Services
- Chimney Relining Repair & Restoration, Katonah
- Chinese Restaurants, Katonah
- Chiropractor, Katonah
- Christian Churches, Katonah
- Churches 1 Of 3, Katonah
- Churches 2 Of 3, Katonah
- Churches Christian Science, Katonah
- City & County Government, Katonah
- Cleaning & Maintenance Services, Katonah
- Cleaning & Restoration Contractors, Including Sandblasting, Katonah
- Clinics, Katonah
- Clothing Stores, Katonah - Clothes & Accessories
- Coffee, Espresso & Tea House Restaurants, Katonah
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- Commercial & Industrial Photographers, Katonah
- Commercial Equipment, Katonah
- Commercial Printing Manufacturers, Katonah
- Commercial, Industrial & Office Space for Rent & Lease, Katonah
- Communications Consultants, Katonah
- Communications Services, Katonah
- Community Services, Katonah
- Computer & Audio Visual Services, Katonah
- Computer & Software Stores, Katonah
- Computer Repair, Katonah
- Computer Software & Services, Katonah
- Computer Software Service, Katonah
- Computer System Consultants, Katonah - IT Consulting Services
- Computer System Designers & Consultants, Katonah
- Condominiums & Townhomes for Rent, Katonah - Townhouses & Condos for Rent & Lease
- Construction, Katonah
- Construction Estimators, Katonah
- Construction Services, Katonah
- Consultants & Services, Katonah
- Consultants Referral Service, Katonah
- Convenience Stores, Katonah
- Convention & Meeting Facilities, Katonah - Meeting Rooms
- Copying & Duplicating Services, Katonah
- Cosmetics, Katonah
- Counseling Professionals, Katonah
- Craft Supplies, Katonah - Hobby & Craft Stores
- Credit Card Merchant Services, Katonah
- Credit Card Plan Services, Katonah
- Cremation Services, Supplies & Equipment, Katonah
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