- Real Estate, Calverton - Agent, Broker & Companies
- Real Estate Developers, Calverton
- Real Estate Management, Calverton
- Real Estate Services, Calverton
- Religious Organizations, Calverton
- Repair Services, Calverton
- Research & Development Labs, Calverton - Laboratories
- Research Services, Calverton
- Resident Camps, Calverton
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- Residential, Calverton
- Residential Construction Contractors, Calverton - General Contractors
- Resorts & Hotels, Calverton
- Restaurant Equipment Repair & Service, Calverton - Bakery, Beverage, Food & Soda Fountain Equipment
- Restaurants/Food & Dining, Calverton
- Retirement Communities & Home, Assisted Living & Apartments, Calverton
- Rifle & Pistol Ranges, Calverton
- Roofing Consultants, Calverton - Roofing Companies
- Roofing Contractors, Calverton - Roof Repair, Cleaning, Installation & Maintenance - Roofers
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