- Racing Apparel & Collectibles, Frostburg
- Radio Stations & Broadcasting Companies, Frostburg
- Real Estate, Frostburg - Agent, Broker & Companies
- Real Estate Agencies, Frostburg
- Real Estate Appraiser, Frostburg - Appraisal Services
- Real Estate Appraisers & Consulting Services, Frostburg
- Real Estate Developers, Frostburg
- Real Estate Management, Frostburg
- Real Estate Services, Frostburg
- Refuse Collection & Disposal Services, Frostburg
- Rehabilitation Centers, Products & Services, Frostburg
- Rehabilitation Specialists, Frostburg
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- Religious Organizations, Frostburg
- Repair Services, Frostburg
- Residential, Frostburg
- Residential Apartments, Frostburg
- Restaurant & Lounge, Bar, Or Pub, Frostburg
- Restaurants/Food & Dining, Frostburg
- Retail Book Stores, Frostburg
- Retirement Communities & Home, Assisted Living & Apartments, Frostburg
- Roadside Assistance, Road Service & Towing Service, Frostburg
- Rods, Springs & Suspension Equipment & Supplies, Frostburg
- Roofing Consultants, Frostburg - Roofing Companies
- Roofing Contractors, Frostburg - Roof Repair, Cleaning, Installation & Maintenance - Roofers
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