- Casual Dining Restaurants, Keenesburg
- Chemical Products, Keenesburg - Chemical Distributors, Dealers, Wholesale, etc
- Churches 1 Of 3, Keenesburg
- City & County Administrative Agencies, Keenesburg
- City & County Government, Keenesburg
- Clock Repair, Keenesburg
- Coal Miner & Shippers, Keenesburg - Coal Mining
- Coffee, Espresso & Tea House Restaurants, Keenesburg
- Commodity & Merchandise Storage & Warehouse, Keenesburg - Warehousing
- Communications Services, Keenesburg
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- Community & Recreational Facilities, Keenesburg
- Community Church, Keenesburg
- Community Churches, Keenesburg
- Community Services, Keenesburg
- Concrete Contractors, Keenesburg - Concrete Construction & Concrete Companies
- Condiments & Sauces, Keenesburg
- Construction, Keenesburg
- Crane Services, Keenesburg
- Cranes Hoisting & Rigging Service, Keenesburg - Crane Rental Service
- Crop Planting & Protecting, Keenesburg - Soil Preparation & Cultivating
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