- Cable TV Companies & Services, Hahnville
- Campgrounds, Hahnville
- Card & Game Rooms & Services, Hahnville
- Cargo Containers, Hahnville - Freight Containers
- Casual Dining Restaurants, Hahnville
- Caterers Food Services, Hahnville
- Catholic Churches, Hahnville
- Chemical Manufacturers, Hahnville
- Chemical Cleaning, Hahnville
- Chemical Compounds, Hahnville
- Chemical Product Manufacturers, Hahnville
- Chemical Products, Hahnville - Chemical Distributors, Dealers, Wholesale, etc
- Chemicals & Related Products, Hahnville
- Chicken Restaurants, Hahnville
- City & County Government, Hahnville
- City & County Law Enforcement, Hahnville
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- Clothing Stores, Hahnville - Clothes & Accessories
- Commercial & Industrial Building Contractors, Hahnville
- Commercial Equipment, Hahnville
- Communications Services, Hahnville
- Community & Recreational Facilities, Hahnville
- Community Services, Hahnville
- Concrete Contractors, Hahnville - Concrete Construction & Concrete Companies
- Concrete Handling Services, Hahnville - Concrete Pumping
- Construction, Hahnville
- Construction Equipment & Supplies, Hahnville
- Convenience Stores, Hahnville
- Cooling System & Parts, Hahnville - Antifreeze, Radiator, Water Pump, Fan, Hoses, Belts, etc
- County Police, Hahnville
- Credit Unions, Hahnville
- Crude Petroleum & Natural Gas, Hahnville
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