- Cable TV Companies & Services, Leonia
- Car Detailing & Wash Service, Leonia - Auto Detailing
- Car Wash, Cleaning, Wax & Polish Service, Leonia
- Cardiologists, Leonia - Heart Doctors, Physicians & Surgeons (Cardiology)
- Carpet Rug & Upholstery Cleaners, Leonia
- Cars, Truck, Van & SUV Car Dealerships, Leonia - Auto Dealers
- Casual Dining Restaurants, Leonia
- Caterers Food Services, Leonia
- Catholic Churches, Leonia
- Cellular & Mobile Phone Service, Leonia
- Chemical Products, Leonia - Chemical Distributors, Dealers, Wholesale, etc
- Chicken Restaurants, Leonia
- Child Care & Day Care Services, Leonia
- Chinese Restaurants, Leonia
- Chiropractor, Leonia
- Christian Churches, Leonia
- Churches 1 Of 3, Leonia
- Churches 2 Of 3, Leonia
- City & County Administrative Agencies, Leonia
- City & County Government, Leonia
- Cleaning & Maintenance Services, Leonia
- Cleaning & Restoration Contractors, Including Sandblasting, Leonia
- Clothing Stores, Leonia - Clothes & Accessories
- Coffee, Leonia
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- Coffee, Espresso & Tea House Restaurants, Leonia
- Colleges & Universities, Leonia
- Commercial & Industrial Laundry, Leonia
- Commercial Equipment, Leonia
- Communications Services, Leonia
- Community Services, Leonia
- Computer & Audio Visual Services, Leonia
- Computer & Laptop Repair, Leonia - PC Repair Services
- Computer & Software Stores, Leonia
- Computer Programming & Software Development Services, Leonia
- Computer Repair, Leonia
- Computer Software & Services, Leonia
- Computer Software Service, Leonia
- Computer Stores, Leonia
- Computer System Consultants, Leonia - IT Consulting Services
- Computer System Designer & Consultant, Leonia
- Construction, Leonia
- Construction Services, Leonia
- Consultants & Services, Leonia
- Contractor Equipment & Supplies, Leonia - Construction Equipment & Machinery
- Contractors Equipment & Supplies - Rental & Leasing, Leonia
- Credit Card Plan Services, Leonia
- Custom Sewing & Alterations, Leonia
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