- Cafe Restaurants, Castroville
- Car Detailing & Wash Service, Castroville - Auto Detailing
- Cars, Truck, Van & SUV Car Dealerships, Castroville - Auto Dealers
- Casual Dining Restaurants, Castroville
- Catholic Churches, Castroville
- Central American Restaurants, Castroville
- Chambers Of Commerce, Castroville
- Chemicals & Related Products, Castroville
- Chicken Restaurants, Castroville
- Child Care & Day Care Services, Castroville
- Churches 1 Of 3, Castroville
- City & County Administrative Agencies, Castroville
- City & County Government, Castroville
- City & County Law Enforcement, Castroville
- Clinics, Castroville
- CNC Machine Shop, Castroville
- Commercial Equipment, Castroville
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- Community Church, Castroville
- Community Churches, Castroville
- Community Services, Castroville
- Computer & Laptop Repair, Castroville - PC Repair Services
- Computer Repair, Castroville
- Computer Services, Castroville
- Construction, Castroville
- Construction Services, Castroville
- Contact Lenses, Castroville
- Convenience Stores, Castroville
- Convention & Meeting Facilities, Castroville - Meeting Rooms
- Copier & Copy Machine Sales, Supplies, Service & Repair, Castroville
- Copier & Copy Machine Supplies, Equipment & Parts, Castroville
- Copying & Duplicating Services, Castroville
- Cosmetics, Castroville
- County Police, Castroville
- Crop Planting & Protecting, Castroville - Soil Preparation & Cultivating
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