- Accounting, Auditing & Bookkeeping Services, Jefferson
- Additional Educational Opportunities, Jefferson
- Adult & Geriatric Social Services, Jefferson
- Adventist Churches, Jefferson
- Agricultural Insurance, Jefferson
- Agriculture, Jefferson
- Air Conditioning Repair & Service, Jefferson - HVAC - Cooling & Heating Repair
- Airport, Jefferson
- Alarm Systems, Jefferson
- Alcohol & Drug Prevention Education, Jefferson
- Alterations & Tailors, Jefferson
- Animal Feeds, Jefferson
- Antique Stores, Jefferson - Antique Mall, Dealers & Shops
- Apartment Building Operators, Jefferson
- Apartments & Buildings, Jefferson
- Appliance Repair & Service, Jefferson
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- Appliances Ironers, Jefferson
- Art Galleries & Dealers, Jefferson
- Arts & Crafts Supplies & Stores, Jefferson
- Arts & Culture, Jefferson
- Asphalt Paving Contractors, Jefferson - Asphalt Repair, Install & Maintenance
- Assembly Of God Church, Jefferson
- Assisted Living Facilities, Jefferson
- Attorneys & Lawyers, Jefferson
- Attorneys & Lawyers, Jefferson
- Auto Body Repair & Paint Shop, Jefferson - Auto Body Shop
- Auto Insurance, Jefferson
- Auto Parts, Accessories, Equipment & Supplies, Jefferson
- Auto Repair Shops & Maintenance Service, Jefferson - Auto Mechanic & Car Repair Shops
- Auto Repair Shops - General, Jefferson
- Auto Services, Jefferson
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