- Racing Car Supplies, Middleton
- Radiation Physics Services, Middleton
- Radiator Coolant & Solvents, Middleton - Engine Coolant
- Radiator Repair, Middleton - Gas Tank Repair
- Radio & Television Repair Shops , Middleton - TV Repair
- Radiologists, Middleton - Radiology Doctors, Physicians & Surgeons
- Radiology Equipment & Services, Middleton - X-Ray Equipment & Supplies
- Railroad Companies, Middleton
- Reading Instruction Schools, Middleton
- Ready Mix Concrete, Middleton - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Middleton
- Real Estate, Middleton - Agent, Broker & Companies
- Real Estate Agencies, Middleton
- Real Estate Agent - Property Lessors, Middleton
- Real Estate Appraiser, Middleton - Appraisal Services
- Real Estate Appraisers & Consulting Services, Middleton
- Real Estate Attorneys & Lawyers, Middleton
- Real Estate Attorneys & Lawyers, Middleton
- Real Estate Consultants, Middleton
- Real Estate Developers, Middleton
- Real Estate Inspectors, Middleton - Real Estate Inspection Service
- Real Estate Investment Trusts, Middleton
- Real Estate Lawyers & Attorneys, Middleton
- Real Estate Management, Middleton
- Real Estate Services, Middleton
- Recording Studio Equipment, Middleton
- Recycling Drop-Off Centers, Middleton
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- Recycling Scrap & Waste Materials, Middleton - Scrap Metal, etc
- Reducing Exercise & Weight Control Services, Middleton
- Rehabilitation Centers, Products & Services, Middleton
- Rehabilitation Specialists, Middleton
- Rehabilitational Job Training Services, Middleton
- Religious Organizations, Middleton
- Rental & Leasing Business Equipment, Middleton
- Repair Services, Middleton
- Research & Development Bureaus, Middleton - Commercial, Economic, Sociological & Educational Research
- Research & Development Labs, Middleton - Laboratories
- Research Film Laboratories & Film Services Motion Pictures, Middleton
- Research Services, Middleton
- Residential, Middleton
- Residential Apartments, Middleton
- Residential Architect, Middleton
- Residential Care Facilities, Middleton
- Residential Construction Contractors, Middleton - General Contractors
- Resorts & Hotels, Middleton
- Restaurant & Lounge, Bar, Or Pub, Middleton
- Restaurants/Food & Dining, Middleton
- Retail Book Stores, Middleton
- Retirement & Estate Planning, Middleton
- Retirement Communities & Home, Assisted Living & Apartments, Middleton
- Retirement Planning Consultants & Services, Middleton
- Roofing Consultants, Middleton - Roofing Companies
- Roofing Contractors, Middleton - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Rubber Products, Middleton
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