- Cafe Restaurants, Houghton
- Campers & Pick-Up Canopies Parts & Supplies, Houghton
- Campus Ministries, Houghton
- Candy Manufacturers, Houghton
- Candy, Nut & Confectionery Wholesale & Retail, Houghton - Candy Stores
- Canoes & Kayaks, Houghton - Equipment, Gear, PFD, Paddles & Accessories
- Car Detailing & Wash Service, Houghton - Auto Detailing
- Car Rental, Houghton - Rental Cars & Lease Service
- Car Wash, Cleaning, Wax & Polish Service, Houghton
- Carpet & Rug Cleaners Water Extraction & Restoration, Houghton
- Carpet Rug & Upholstery Cleaners, Houghton
- Casual Dining Restaurants, Houghton
- Caterers Food Services, Houghton
- Catholic Churches, Houghton
- Cellular & Mobile Phone Equipment & Systems Installation, Repair & Service, Houghton
- Cellular & Mobile Phone Service, Houghton
- Central American Restaurants, Houghton
- Chambers Of Commerce, Houghton
- Check Cashing Services, Houghton
- Child Care & Day Care Services, Houghton
- Child Related Social Services, Houghton
- Chinese Restaurants, Houghton
- Chiropractor, Houghton
- Christian Churches, Houghton
- Church Of Christ, Houghton
- Church Of Jesus Christ Of Latter Day Saints, Houghton
- Churches 1 Of 3, Houghton
- Churches Seventh Day Adventist, Houghton
- Cigar, Cigarette & Tobacco Store & Supplies, Houghton
- City & County Administrative Agencies, Houghton
- City & County Government, Houghton
- Cleaning & Maintenance Services, Houghton
- Cleaning & Restoration Contractors, Including Sandblasting, Houghton
- Cleaning Supplies, Systems & Equipment, Houghton - Janitorial Supplies
- Clergy, Houghton
- Clinics, Houghton
- Clothing & Accessories Resale & Consignment Shops, Houghton
- Clothing Stores, Houghton - Clothes & Accessories
- Coffee, Espresso & Tea House Restaurants, Houghton
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- Collectibles, Houghton
- Colleges & Universities, Houghton
- Commercial & Industrial Photographers, Houghton
- Commercial Printing, Houghton
- Commercial Printing Manufacturers, Houghton
- Communications Services, Houghton
- Community & Recreational Facilities, Houghton
- Community Centers, Houghton
- Community Services, Houghton
- Computer & Audio Visual Services, Houghton
- Computer & Laptop Repair, Houghton - PC Repair Services
- Computer & Software Stores, Houghton
- Computer Repair, Houghton
- Computer Software & Services, Houghton
- Computer Software Service, Houghton
- Computer Supplies, Parts, Equipments & Accessories, Houghton
- Computer System Consultants, Houghton - IT Consulting Services
- Computer System Designers & Consultants, Houghton
- Concrete, Houghton - Cement & Concrete Products, Suppliers, Companies
- Concrete & Cement, Houghton
- Concrete & Pumice Bricks, Houghton
- Concrete Product Manufacturers, Houghton
- Construction, Houghton
- Construction Services, Houghton
- Consultants & Services, Houghton
- Convenience Stores, Houghton
- Convention & Meeting Facilities, Houghton - Meeting Rooms
- Copying & Duplicating Services, Houghton
- Credit Card Merchant Services, Houghton
- Credit Card Plan Services, Houghton
- Credit Unions, Houghton
- Cremation Services, Supplies & Equipment, Houghton
- Criminal Attorneys & Lawyers, Houghton
- Criminal Defense Attorneys & Lawyers, Houghton
- Criminal Defense Lawyers & Attorneys, Houghton
- Cruise Agents, Houghton - Travel Agents
- Cruise Lines, Houghton - Cruises
- Custom Parts & Accessories, Houghton
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