- Accessibility & Disability Equipment & Supplies, Northumberland - Disabled Help Aids
- Accounting, Auditing & Bookkeeping Services, Northumberland
- Adult & Geriatric Social Services, Northumberland
- Agriculture, Northumberland
- American Legions, Northumberland
- Antique Stores, Northumberland - Antique Mall, Dealers & Shops
- Apartment Building Operators, Northumberland
- Apartments & Buildings, Northumberland
- Appliance Repair & Service, Northumberland
- Appraisers, Northumberland
- Arts & Culture, Northumberland
- Asian Restaurants, Northumberland
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- Attorneys & Lawyers, Northumberland
- Attorneys & Lawyers, Northumberland
- ATV & RV Dealers, Northumberland - All-Terrain & Recreational Vehicles
- Auto & Truck Brokers, Northumberland
- Auto Body Repair & Paint Shop, Northumberland - Auto Body Shop
- Auto Paint, Lettering & Striping Services, Northumberland
- Auto Parts, Accessories, Equipment & Supplies, Northumberland
- Auto Repair Shops & Maintenance Service, Northumberland - Auto Mechanic & Car Repair Shops
- Auto Services, Northumberland
- Auto Utility Trailers, Northumberland
- Auto, Car & Truck Accessories, Northumberland
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