- Cabins Cottages & Chalet Rental, San Ysidro
- Cafe Restaurants, San Ysidro
- California Cuisine Restaurants, San Ysidro
- Campgrounds, San Ysidro
- Candy, Nut & Confectionery Wholesale & Retail, San Ysidro - Candy Stores
- Canvas Goods & Products, San Ysidro
- Car Rental, San Ysidro - Rental Cars & Lease Service
- Carpet, Rug & Linoleum Flooring Dealers, San Ysidro
- Cars, Truck, Van & SUV Car Dealerships, San Ysidro - Auto Dealers
- Casual Dining Restaurants, San Ysidro
- Catholic Churches, San Ysidro
- Cell & Mobile Installation Repairs, San Ysidro
- Cellular & Mobile Phone Equipment & Systems Installation, Repair & Service, San Ysidro
- Cellular & Mobile Phone Service, San Ysidro
- Central American Restaurants, San Ysidro
- Charitable & Non-Profit Organizations, San Ysidro
- Check Cashing Services, San Ysidro
- Chicken Restaurants, San Ysidro
- Child Care & Day Care Services, San Ysidro
- Children's Clothing Stores, San Ysidro - Infant, Babies & Kids Clothing
- Chinese Restaurants, San Ysidro
- Churches 1 Of 3, San Ysidro
- Churches 2 Of 3, San Ysidro
- Churches 3 Of 3, San Ysidro
- Churches Seventh Day Adventist, San Ysidro
- Cigar, Cigarette & Tobacco Store & Supplies, San Ysidro
- City & County Government, San Ysidro
- Clinics, San Ysidro
- Clock & Watch Stores, San Ysidro
- Clothing & Accessories Resale & Consignment Shops, San Ysidro
- Clothing Stores, San Ysidro - Clothes & Accessories
- Coaching Business & Personal, San Ysidro
- Coffee, Espresso & Tea House Restaurants, San Ysidro
- Colleges & Universities, San Ysidro
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- Commercial Equipment, San Ysidro
- Commercial Printing Manufacturers, San Ysidro
- Commercial, Industrial & Office Space for Rent & Lease, San Ysidro
- Commodity & Merchandise Storage & Warehouse, San Ysidro - Warehousing
- Communications Contractors, San Ysidro
- Communications Services, San Ysidro
- Community Church, San Ysidro
- Community Churches, San Ysidro
- Community Services, San Ysidro
- Computer & Laptop Repair, San Ysidro - PC Repair Services
- Computer & Software Stores, San Ysidro
- Computer Repair, San Ysidro
- Condominiums & Townhomes for Rent, San Ysidro - Townhouses & Condos for Rent & Lease
- Construction, San Ysidro
- Consultants & Services, San Ysidro
- Consultants Referral Service, San Ysidro
- Convenience Stores, San Ysidro
- Convention Services - Other, San Ysidro
- Copying & Duplicating Services, San Ysidro
- Cosmetics, San Ysidro
- Cosmetics & Perfumes Outlets, San Ysidro
- Cosmetics, Toiletries, Perfumes & Beauty Supply Stores, San Ysidro
- Counseling Services, San Ysidro
- Courier Service, San Ysidro
- Craft Supplies, San Ysidro - Hobby & Craft Stores
- Credit Card Merchant Services, San Ysidro
- Credit Card Plan Services, San Ysidro
- Credit Unions, San Ysidro
- Criminal Attorneys & Lawyers, San Ysidro
- Criminal Defense Attorneys & Lawyers, San Ysidro
- Criminal Defense Lawyers & Attorneys, San Ysidro
- Crystals Industrial & Gem, San Ysidro
- Custom Parts & Accessories, San Ysidro
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