- All America Auto Transport
 - Bethesda - Association of International Automobile Manufacturers, Inc.
- Arlington - Provides information, analysis, guidance, and advocacy on business issues of interest to international automobile companies.
- Alpine Armoring Inc.
- Herndon - Armoured vehicles manufacturer specialising in new and used armoured vehicles, bulletproof cars, vans, and trucks. Also offers law enforcement equipment, Kevlar products, and body armour.
- Potomac German Auto
- Frederick - Supplier of recycled/used Mercedes-Benz parts.
- Ideal Buick GMC Hyundai
- Frederick - Offering new cars and trucks, used vehicles, parts and service.
- Frederick Motor Company
- Frederick
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