- ABGlobal Translations
 - Silver Spring - Offers services in all languages for business, technology, law, and medicine. - China Consultant
- Provides English to Chinese and Chinese to English translations and interpretation.
- Comprehensive Language Center
- Arlington - Provides translators, interpreters, and narrators in several languages.
- Diplomatic Language Services, Inc.
- Arlington - Foreign and English language training, management training, e-learning, translation and interpreting services for a wide range of languages.
- Emissary Russian Interpretation & Translation Services
- Falls Church - Russian interpretation and translation services serving clients worldwide.
- Language Learning Enterprises, Inc.
- Foreign language company for business, government and individuals.
- M2 Limited
- Gaithersburg - Translation, localisation, internationalisation services.
- Professional Interpreter Exchange, Inc.
- Laurel - Sign language interpreting services provided by a deaf and certified interpreter owned company.
- Russian Language Communications, Inc.
- Comprehensive translation and interpretation services, ranging from business cards to technical manuals to web pages.
- Sign Language Associates, Inc
- Silver Spring - SLA provides sign language interpreting services and ASL instruction to our clients in the DC metro area & all 10 federal regions.
- Trans-Semantics
- Translations of legal and technical documents including trademark, transcripts, contracts, scientific journals, and correspondence.
- Zmudzki, Marcin
- Provides Polish conference interpreting and written translation services.
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