- Karaoke, Gaithersburg
- Karaoke Machines, Equipment & Supplies, Gaithersburg
- Kerosene, Heating Oils & Fuels Dealers, Gaithersburg
- Kids Furniture Repair, Refinishing & Restoring, Gaithersburg
- Kitchen & Bath Housewares, Gaithersburg
- Kitchen & Bath Housewares Manufacturers, Gaithersburg
- Kitchen & Bath Products & Supplies, Gaithersburg
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- Kitchen & Bath Products & Supplies, Gaithersburg
- Kitchen Accessories, Gaithersburg - Kitchenware & Glassware
- Kitchen Cabinets, Gaithersburg - Bathroom Cabinets
- Kitchen Countertops, Bathroom Countertops & Sinks, Gaithersburg - Marble, Granite, Quartz, Laminate, Wood, Formica, Glass, Soapstone, Corian, Solid Surface & Concrete Countertops
- Kitchen Remodeling, Gaithersburg - Kitchen Remodel & Planning Services
- Knitting & Crocheting Supplies, Gaithersburg
- Korean Restaurants, Gaithersburg
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