- Accounting, Auditing & Bookkeeping Services, Jamesville
- Additional Educational Opportunities, Jamesville
- Adult & Geriatric Social Services, Jamesville
- Agriculture, Jamesville
- Alarm Systems, Jamesville
- Animal Hospitals, Jamesville - Veterinary Clinic & Hospital
- Antique Stores, Jamesville - Antique Mall, Dealers & Shops
- Apartment Building Operators, Jamesville
- Apartments & Buildings, Jamesville
- Appraisers, Jamesville
- Aquariums Rental & Leasing, Jamesville
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- Arts & Crafts Supplies & Stores, Jamesville
- Arts & Culture, Jamesville
- Asphalt & Asphalt Products, Jamesville - Asphalt Companies, Wholesale, Manufacturers & Suppliers
- Asphalt & Paving Materials, Jamesville - Companies & Suppliers
- Assisted Living Facilities, Jamesville
- Attorneys & Lawyers, Jamesville
- Attorneys & Lawyers, Jamesville
- Auto Body Paint Equipment & Supplies, Jamesville
- Auto Parts, Accessories, Equipment & Supplies, Jamesville
- Auto Repair Shops & Maintenance Service, Jamesville - Auto Mechanic & Car Repair Shops
- Auto Services, Jamesville
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