- Calculating & Statistical Services, Adelphi
- Card & Game Rooms & Services, Adelphi
- Casual Dining Restaurants, Adelphi
- Chicken Restaurants, Adelphi
- Child Care & Day Care Services, Adelphi
- Child Care - Individualized, Adelphi
- Chinese Restaurants, Adelphi
- Christadelphian Churches, Adelphi
- Christian Churches, Adelphi
- Churches 1 Of 3, Adelphi
- Churches 2 Of 3, Adelphi
- Churches 3 Of 3, Adelphi
- Churches Christian Science, Adelphi
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- Cleaning & Maintenance Services, Adelphi
- Clinics, Adelphi
- Colleges & Universities, Adelphi
- Commercial, Industrial & Office Space for Rent & Lease, Adelphi
- Community & Recreational Facilities, Adelphi
- Community Services, Adelphi
- Computer & Audio Visual Services, Adelphi
- Computer System Consultants, Adelphi - IT Consulting Services
- Computer System Designers & Consultants, Adelphi
- Condominiums & Townhomes for Rent, Adelphi - Townhouses & Condos for Rent & Lease
- Construction, Adelphi
- Consultants & Services, Adelphi
- Convenience Stores, Adelphi
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