- Cable television services
- Cafeteria Management
- Cafeteria Services
- Camel Riding Tours
- Camera, photo, and optical goods stores
- Campaign Management
- Camping Equipment Supplies and Services
- Camping Grounds
- Canals and Locks
- Canned Fruit Wholesale
- Canoe/Kayak Rental
- Canoe Rental
- Car Rental Agencies
- Car rental companies
- Car rental and leasing activities
- Car Rental Services for Students and Licensing Tests
- Cardiologists
- Cardiology activities
- Cardiology Services
- Career Coaching and Consulting Services
- Career Counseling and Coaching Services
- Cargo and baggage handling
- Cargo loading and unloading
- Cargo Management Services for Air Passengers
- Cargo Plane Leasing
- Cargo surveying and weighing services
- Carpentry
- Carpentry and Joinery activities
- Carpet Manufacturing
- Carpet, Rug, and Upholstery Manufacturing
- Case Management Services
- Cash advances
- Cash Flow Management & Analysis
- Casinos
- Casinos and Gambling Establishments
- Casting
- Castings of Aluminum
- Casual Dining Restaurants
- Catalog Sales
- Catalog Shopping Retail
- Catering Services for Conferences and Exhibitions
- Catering Services at Motorsport Venues
- Cattle Breeding
- CD Duplication & Replication
- Cellphone Retailers
- Cement Plaster Installation
- Cemeteries
- Ceramic Brick and Tile Manufacturing
- Chamber of Commerce Organizations
- Charcuterie Production
- Charitable organisations
- Charter Air Freight Services
- Charter flights
- Charter flights for passengers and freight
- Chartering and leasing of Cargo Vessels
- Charters for extracurricular events and activities
- Chauffeur Services
- Cheese
- Cheese manufacturing
- Chemical Engineering
- Chemical and Process Plant Design Services
- Chemical Processing and Refining
- Chicken Processing & Packaging
- Child and Family Services
- Child Care and Nanny Services
- Child Care Services
- Child Welfare Services
- Children's Furniture Retailers
- Children's health activities
- Chimney Liner Installation
- Circuit Breakers
- Circus Arts
- Civil Engineering and Structural Design
- Civil Engineering for Railways
- Civil engineering services
- Civil Rights Law
- Clay Brick Manufacturing
- Cleaning and Maintenance Services
- Cleaning Services
- Cleaning services for buses and coaches at bus and coach stations
- Clearing and Grubbing
- Climate Change Consulting Services
- Clinical Trials Regulation
- Clock Cleaning and Maintenance
- Clock Parts Replacement
- Clock Refurbishment Services
- Clothing and Accessories Stores
- Clothing and clothing accessories stores
- Clothing and Textiles
- Cloud computing solutions
- CNC Machine Tools Agents
- Compressed Natural Gas (CNG) Delivery & Equipment Sales
- Co-operative Banks
- Coaching Services
- Coal Agglomeration
- Coal mining
- Coal Processing
- Coastal Aquaculture
- Coastal Container Shipping
- Coastal freight water transport
- Coastal Shipping
- Coastal Tour Boats
- Coating and Decorating of Flat Glass
- Cocktail Lounges & Clubs
- Coffee Shops
- Coffee & Tea Serving
- Coin minting
- Coin operated laundromats
- Coin pressing
- Coke production
- Cold drawing of shaped-profile bars
- Cold Forming/Drawing for Precision Shapes and Profiles
- Cold Heading
- Cold Rolling of Aluminum Strips
- Cold Rolling of Carbon Steel Strips
- Cold Rolling of Galvanized Steel Strips
- Cold Rolling of Medium Width Strip
- Cold Rolling of Copper Strips
- Cold Rolling of Pre-painted Steel Strips
- Cold storage warehousing and storage
- Collecting seeds for re-planting
- Collection Agencies
- Collection Agency
- Collection and Recovery of Glass
- Collections Agencies
- College and University Degree Programs
- Colleges and Universities
- Color Coordination Assistance
- Colour Correction Services
- Commercial and advertising photography
- Commercial Architecture
- Commercial Cleaning
- Commercial Collection of Non-Hazardous Waste
- Commercial Condos/Units
- Commercial legal advice
- Commercial Lending
- Commercial Real Estate
- Commercial Real Estate Renting and Operating
- Commercial Roofing
- Commodities and Futures Trading
- Commodity Brokerage
- Commodity-Specific Investment Funds
- Community outreach programs for adults
- Community-based recovery support groups for families affected by addiction
- Community Support Services
- Commuter Rail Transport
- Companion Animal Care & Training
- Computer and information literacy training
- Computer facilities management services
- Computer hardware design
- Computer Programmers and Software Developers
- Computer programming, consultancy and related activities
- Computer Rentals
- Computer Repair
- Computer Repair Services
- Computer Science
- Computer Science and Information Systems Education
- Computer science-related research
- Computer System Design and Programming Services
- Computer systems design and related services
- Computer Technology
- Concrete Breaking & Removing
- Concrete Sawing and Drilling
- Condensed Milk
- Condominium and Townhome Construction
- Conference and Event Planning
- Conference Centers
- Conference centre lodging activities
- Conference services for golf courses
- Configuration and Maintenance Services
- Consignment Shops
- Construction and Demolition Site Collection of Non-Hazardous Waste
- Construction and Development Management
- Construction Equipment Rental
- Construction machinery rental and leasing activities
- Construction and Maintenance of Decks, Porches, Gazebos, etc.
- Construction and Maintenance of Motor Racing Tracks
- Construction of light metal structures
- Construction of tunnels
- Construction recruitment
- Construction Services
- Construction Site Cleanup
- Consultancy and Advisory Services
- Consultancy Services for Mushroom Production
- Consultancy services for security systems
- Consultants
- Consultation services for newspaper publishing
- Consulting on building processes such as design or project management
- Consulting on Risk Management
- Consulting Services
- Consulting Services for IT Solutions Implementation
- Consumer Credit
- Consumer Electronics Retailers
- Consumer finance companies
- Consumer Goods Sales
- Consumer Receivable Financing
- Container leasing
- Container loading/unloading
- Container shipping services
- Contract labour hiring
- Converting activities for the production of folded cartons, window envelopes and labels from paper or plastic materials
- Cooking and Meal Preparation
- Cooling Towers and Chillers
- Copper Mining
- Copper Ore Mining
- Copper Smelting
- Copper and Steel Roofs Installation
- Copyright Agents
- Copywriting and Editorial Services
- Copywriting/Editing Services
- Core Drilling
- Corporate Catering
- Corporate Finance
- Corporate Finance and Advisory Services
- Corporate Financing Services
- Corporate Governance
- Corporate Governance Advisory Services
- Corporate Housing Providers
- Corporate Strategy
- Corporate Video Production
- Corrections and detention facility operations
- Corrugated and Solid Fiber Box Manufacturing
- Cosmetics and beauty products in department stores
- Cosmetics Retail
- Cosmetics, Toiletries, Cleaning Supplies
- Costume Design & Fabrication
- Cotton Ginning
- Cotton Growing
- Cotton Textiles Manufacturing
- Cotton Weaving
- Cotton and Woolen Fibers Agents
- Counseling services
- Counselling and Therapy
- Courier and delivery services
- Courier and messenger services
- Courier & Delivery Services
- Courier Pickup & Drop-off Services
- Courier Same-Day Delivery Services
- Courier services
- Courier Services by Aircraft
- Courtroom Technology Solutions
- Craft Beer Bars
- Craft Distilling
- Cream Processing
- Creative Agency Services
- Creative Services
- Credit and Surety Reinsurance
- Credit Bureaus
- Credit bureaus and related activities
- Credit card issuing and merchant banking activities
- Credit card issuing services
- Credit Card Processing Services
- Credit Card Services
- Credit Scoring
- Criminal investigation activities
- Crisis Communication
- Crisis Communications Consulting
- Critical Illness Reinsurance
- Crochetwear production and finishing services
- Crop Production
- Crop Selection and Rotation Strategies for Greenhouses
- Cruise Booking Agents
- Cruise line reservation services
- Cruise Ship Operators
- Cruise Ships
- Cruise Ships and Ocean Liners
- Crustacean Preserving
- Culinary Arts and Food Preparation Education
- Cultivation and Propagation Of Horticultural Specialties
- Cultivation and Propagation Of Other Nuts
- Cultivation of Grapevines for Ornamental Purposes
- Cultivation/Harvesting/Processing/Preservation/Packaging etc.of mushrooms Other non-perennial crop growing n.e.c
- Cultivation of spices such as pepper, ginger, turmeric etc.
- Cultivation of sugar cane
- Cultural activities
- Cultural Enrichment Programs
- Cultural, Recreational, and Sporting Activities
- Cultural Studies Research and Development
- Curing and Smoking of Fish
- Curing and Smoking of Meat
- Custom fitting services for hearing aids
- Custom Paint Jobs for Cars, Trucks, Boats, Motorcycles, etc.
- Custom publications & newsletters
- Custom Rug Making
- Custom software development services
- Customer Care/Support
- Customized Clothing Design and Sales
- Customs clearance services
- Cutting of stone
- Cybersecurity monitoring