- Cable TV Companies & Services, Madisonville
- Cafe Restaurants, Madisonville
- Car Detailing & Wash Service, Madisonville - Auto Detailing
- Casual Dining Restaurants, Madisonville
- Caterers Food Services, Madisonville
- Catholic Churches, Madisonville
- Chambers Of Commerce, Madisonville
- Chemicals & Related Products, Madisonville
- Child Care & Day Care Services, Madisonville
- Churches 1 Of 3, Madisonville
- Cigar, Cigarette & Tobacco Store & Supplies, Madisonville
- City & County Government, Madisonville
- Clinics, Madisonville
- Coffee & Tea Stores, Madisonville
- Coffee Grinding Mills, Madisonville
- Coin Operated Amusement Devices, Madisonville
- Combustibles & Explosives, Madisonville
- Communications Services, Madisonville
- Community Services, Madisonville
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- Computer & Audio Visual Services, Madisonville
- Computer & Software Stores, Madisonville
- Computer Repair, Madisonville
- Computer Services, Madisonville
- Computer Software & Services, Madisonville
- Computer Software Service, Madisonville
- Computer System Consultants, Madisonville - IT Consulting Services
- Computer System Designers & Consultants, Madisonville
- Construction, Madisonville
- Construction Companies, Madisonville
- Construction Services, Madisonville
- Consultants & Services, Madisonville
- Contractor Equipment & Supplies, Madisonville - Construction Equipment & Machinery
- Control Systems & Regulators, Madisonville
- Convention & Meeting Facilities, Madisonville - Meeting Rooms
- Cosmetics, Toiletries, Perfumes & Beauty Supply Stores, Madisonville
- Court Reporter , Madisonville - Stenographer & Convention Reporters
- Custom Sewing & Alterations, Madisonville
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