- Cafe Restaurants, Mattawa
- Campgrounds, Mattawa
- Canoe Trip Outfitters, Mattawa
- Canoes & Kayaks, Mattawa - Equipment, Gear, PFD, Paddles & Accessories
- Canvas Goods & Products, Mattawa
- Casual Dining Restaurants, Mattawa
- Catalog Services, Mattawa
- Catalog, Mail-Order & Electronic Shopping, Mattawa
- Caterers Food Services, Mattawa
- Catholic Churches, Mattawa
- Charitable & Non-Profit Organizations, Mattawa
- Child Care & Day Care Services, Mattawa
- Chinese Grocery Stores, Mattawa
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- Chinese Restaurants, Mattawa
- Chiropractor, Mattawa
- Christian Churches, Mattawa
- Churches 1 Of 3, Mattawa
- Clinics, Mattawa
- Coffee, Mattawa
- Commercial Equipment, Mattawa
- Community & Recreational Facilities, Mattawa
- Community Services, Mattawa
- Construction, Mattawa
- Construction Services, Mattawa
- Convention Services - Other, Mattawa
- Convents & Monasteries, Mattawa
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