- Cable TV Companies & Services, Oswego
- Cafe Restaurants, Oswego
- Candy, Nut & Confectionery Wholesale & Retail, Oswego - Candy Stores
- Casual Dining Restaurants, Oswego
- Child Care & Day Care Services, Oswego
- Chiropractor, Oswego
- Christian Churches, Oswego
- Churches 1 Of 3, Oswego
- City & County Administrative Agencies, Oswego
- City & County Government, Oswego
- City & County Law Enforcement, Oswego
- Civil Attorneys & Lawyers, Oswego
- Civil Rights Attorneys & Lawyers, Oswego
- Civil Rights Lawyers & Attorneys, Oswego
- Clinics, Oswego
- Commercial Printing, Oswego
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- Communications Services, Oswego
- Community & Recreational Facilities, Oswego
- Community Centers, Oswego
- Community Services, Oswego
- Computer & Software Stores, Oswego
- Computer Networks, Oswego - Design & Systems
- Concrete, Oswego - Cement & Concrete Products, Suppliers, Companies
- Concrete & Cement, Oswego
- Concrete Product Manufacturers, Oswego
- Construction, Oswego
- Consultants & Services, Oswego
- Convenience Stores, Oswego
- Cooling System & Parts, Oswego - Antifreeze, Radiator, Water Pump, Fan, Hoses, Belts, etc
- County Police, Oswego
- Customer Service Representatives, Oswego
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