- Campgrounds, Ottawa Lake
- Cars, Truck, Van & SUV Car Dealerships, Ottawa Lake - Auto Dealers
- Casual Dining Restaurants, Ottawa Lake
- Chemicals & Related Products, Ottawa Lake
- Child Care & Day Care Services, Ottawa Lake
- Churches 1 Of 3, Ottawa Lake
- Churches 3 Of 3, Ottawa Lake
- Cleaning & Maintenance Services, Ottawa Lake
- CNC Machine Shop, Ottawa Lake
- Coffee, Espresso & Tea House Restaurants, Ottawa Lake
- Combustibles & Explosives, Ottawa Lake
- Community & Recreational Facilities, Ottawa Lake
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- Community Church, Ottawa Lake
- Community Churches, Ottawa Lake
- Community Services, Ottawa Lake
- Concrete Contractors, Ottawa Lake - Concrete Construction & Concrete Companies
- Construction, Ottawa Lake
- Contractor Equipment & Supplies, Ottawa Lake - Construction Equipment & Machinery
- Convenience Stores, Ottawa Lake
- Cooling Tower & Chemicals Boiler, Ottawa Lake
- Crane Services, Ottawa Lake
- Cranes Hoisting & Rigging Service, Ottawa Lake - Crane Rental Service
- Cryogenic Equipment & Supplies, Ottawa Lake
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