- Accounting Tax & Computer Consultants, Jefferson
- Accounting, Auditing & Bookkeeping Services, Jefferson
- Additional Educational Opportunities, Jefferson
- Administrative Professionals, Jefferson
- Adoption Attorneys & Lawyers, Jefferson
- Adoption Attorneys & Lawyers, Jefferson
- Adoption Lawyers & Attorneys, Jefferson
- Agriculture, Jefferson
- Air & Hydraulic Cylinder, Jefferson
- Aircraft Maintenance & Service, Jefferson
- Airport, Jefferson
- Alarms, Signaling & Security Equipment & Systems, Jefferson
- Ambulance Department, Jefferson
- Amusement Games & Machines, Jefferson
- Animal & Pet Food & Supplies Manufacturers, Jefferson
- Animal Feeds, Jefferson
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- Animal Hospitals, Jefferson - Veterinary Clinic & Hospital
- Animal Protection Organizations, Jefferson
- Apartments & Buildings, Jefferson
- Appliance Repair & Service, Jefferson
- Appraisers, Jefferson
- Arts & Culture, Jefferson
- Attorneys & Lawyers, Jefferson
- Attorneys & Lawyers, Jefferson
- ATV & RV Dealers, Jefferson - All-Terrain & Recreational Vehicles
- Auto Body Repair & Paint Shop, Jefferson - Auto Body Shop
- Auto Customizing, Jefferson
- Auto Driving Schools, Jefferson
- Auto Insurance, Jefferson
- Auto Parts, Accessories, Equipment & Supplies, Jefferson
- Auto Repair Shops & Maintenance Service, Jefferson - Auto Mechanic & Car Repair Shops
- Auto Services, Jefferson
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