- Cable TV Companies & Services, Round Lake
- Cafe Restaurants, Round Lake
- Carpenters, Round Lake - Carpentry Contractors
- Cars, Truck, Van & SUV Car Dealerships, Round Lake - Auto Dealers
- Casual Dining Restaurants, Round Lake
- Caterers Food Services, Round Lake
- Catholic Churches, Round Lake
- Central American Restaurants, Round Lake
- Chemical Cleaning, Round Lake
- Child Care & Day Care Services, Round Lake
- Child Care - Day Care - Private, Round Lake
- Childrens After School Programs, Round Lake
- Chinese Restaurants, Round Lake
- Chiropractor, Round Lake
- Christian Churches, Round Lake
- Churches 1 Of 3, Round Lake
- Churches 2 Of 3, Round Lake
- City & County Government, Round Lake
- City & County Law Enforcement, Round Lake
- Cleaning & Maintenance Services, Round Lake
- Clinics, Round Lake
- Clothing Institutional, Round Lake
- CNC Machine Shop, Round Lake
- Collision Repair & Services, Round Lake
- Commercial & Literacy Writings, Round Lake
- Commercial Building Remodeling & Repair Contractors, Round Lake
- Commercial Equipment, Round Lake
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- Commercial Ovens, Round Lake
- Commercial Printing Manufacturers, Round Lake
- Communications Consultants, Round Lake
- Communications Services, Round Lake
- Community & Recreational Facilities, Round Lake
- Community Church, Round Lake
- Community Churches, Round Lake
- Community Services, Round Lake
- Computer & Software Stores, Round Lake
- Computer Repair, Round Lake
- Computer Software & Services, Round Lake
- Computer Software Service, Round Lake
- Concrete Contractors, Round Lake - Concrete Construction & Concrete Companies
- Construction, Round Lake
- Construction Machinery, Round Lake - Mining Machinery
- Construction Services, Round Lake
- Construction Staking Service, Round Lake
- Consultants & Services, Round Lake
- Consulting Services, Round Lake - Internet Consultants
- Contractor Equipment & Supplies, Round Lake - Construction Equipment & Machinery
- Convenience Stores, Round Lake
- Convention & Corporate Accommodations, Round Lake
- Cooking, Food & Beverage Equipment, Round Lake
- Copier & Copy Machine Sales, Supplies, Service & Repair, Round Lake
- County Police, Round Lake
- Crane Rental & Leasing, Round Lake
- Cranes & Derricks, Round Lake
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