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Research Guides

Washington State Corporate Names, Washington State Trademarks, Washington State Business Names & Licenses

For information about Corporate Names and State Trademarks Contact:

Office of the Secretary of State
Corporations and Charities Division
P.O. Box 40234
Olympia WA 98504-0234

Phone: 360-725-0377

Phone: 360-725-0344 opt 3

Washington State Trademarks Information - Secretary of State, Corporations and Charities Division

Corporations and Charities System
Includes Washington State Trademark search.

For information about State Business Names, Business Licenses, and Trade Names contact:

Washington State Department of Revenue
Business Licensing Service
PO Box 9034
Olympia, WA 98507-9034
Phone: 360-705-6741  (Business licensing)

Open a Business - Washington State Department of Revenue

Businesses - Washington State Department of Revenue

Business Lookup - Washington State Department of Revenue

Trade Names - Washington State Department of Revenue
“Doing Business As” name

Small Business Guidance- Information and resources for small businesses and entrepreneurs in Washington State.

License Lookup - Washington State Department of Licensing

Business and Professional Licenses - Washington State Department of Licensing

State Trademark Resources

For information about state trademarks and service marks (U.S States, District of Columbia, and Puerto Rico):

State Trademark Information Links from the USPTO
List of trademark resources for each state from the U.S. Patent & Trademark Office:  "To acquire trademark and/or service mark registration at the state level, applicants must file an application with the trademark office of the specific state in which protection is sought. For information about state registration requirements, applicants must contact the individual state trademark office."





While the Library reference service staff is happy to provide assistance with your patent or trademark research, we cannot perform searches, evaluate searches, assist with your application or dispense legal advice.

The University of Washington and its employees are providing a service of an informational nature with no express or implied warranty for results and assume no obligation or liability for damage arising out of the use, or inability to use, the information provided.  Every effort is made to keep this information up to date. However, errors and omissions may occur.

For the most up-to-date information or legal advice, please contact a patent or trademark attorney.