- Garment & Linen Services, Chelmsford
- Gas Station, Chelmsford - Service & Filling Station
- General Business Services, Chelmsford
- General Merchandise Stores, Chelmsford
- Generators, Compressors, Pumps, Motors & Fans, Chelmsford
- Gift Shops, Chelmsford - Gift, Novelty & Souvenir Stores
- Gifts, Cards & Stationery Stores, Chelmsford
- Golf Courses, Chelmsford
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- Golf Driving Ranges, Chelmsford
- Golf Equipment & Supplies Stores, Chelmsford - Golf Clubs, Balls, Carts, Bags, Apparel, Shoes & Accessories
- Golf Lessons & Instruction, Chelmsford
- Government, Chelmsford
- Grocery Stores & Supermarkets, Chelmsford
- Ground Transportation, Except Passenger, Chelmsford
- Gymnastic Clubs, Chelmsford
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