How To Do a Business Entity Search in Washington | Tailor Brands (2025)

A thorough business entity search is crucial in forming your Washington LLC and creating your brand identity.

Besides choosing a business name, you should check whether it’s available as a domain so your future customers recognize you online.

You should also check that your desired name is available as a trademark to avoid infringement.

Once you do those, you’ll own your brand identity everywhere you need it.

But before using the Washington business entity search tool to confirm your name’s availability, familiarize yourself with the state’s guidelines and trademark laws to ensure your application is accepted.

The Evergreen State has naming guidelines you must follow when applying to register your LLC name, either by reserving it or when you file your LLC Articles of Organization.

Washington naming requirements:

• Distinctive: Your chosen name must be unlike any entity name already registered on the Washington Department of State's file.
• Specific inclusions: Your name must include one of the following designators: Limited Liability Company, Limited Company, Liability Co, Liability Co., or an approved abbreviation, LLC, L.L.C., Ltd.
• Prohibited words/phrases: Your name cannot include phrases or words showing affiliation with a government department.
• Mandatory exclusions: You cannot use offensive terms or those related to a medical, financial, or insurance institution.

You conduct a business name search using the Washington SOS website, which records all registered business filings in the Evergreen State.

While the business name search website is easy to navigate, there are tips for conducting a thorough search.

Those include:

• For the best research results, begin your search using one word. If your desired business name contains more than one word, add any additional ones if your first search returns zero results.
• The search tool doesn't recognize upper and lower cases, so it doesn't matter which one you use.
• Do not include any spaces that do not exist in your desired business name.
• Leave out LLC designators and punctuation marks.

• Basic search: The basic search option allows you to search using a business name or a UBI (Unified Business Identifier), a number given to registered entities by Washington state.
• Advanced search: The advanced search option enables you to search for an available name using additional criteria that help narrow your search and minimize the results.

• Corporation Search
• UBI Number
• Charity/Fundraiser/Trust Search
• Trademark Search

Using this link, navigate to the Corporation Search page, select contains, enter your desired name, and click search.

For our example, I will use the name Speedy Locksmiths:

• The business name
• Business Type
• Principal Office
• Formation date
• Expiry date
• UBI number
• Business status
• Principle mailing address
• Jurisdiction
• Period of duration
• Nature of business

Using the advanced search, you can also view the details of the business’s registered agents and request further information.

However, if your desired name appears in the search results and is active, then it isn’t available, and you will need to choose a different name.

All separate entities (LLCs, Corporations, and Limited partnerships) can use a fictitious name (Doing Business As) instead of their registered name for branding and marketing purposes.

To register a fictitious name in Washington, you must first confirm it’s available using the Washington Department of Revenue’s Business entity website and search using the fictitious name option.

Once you confirm availability, you file your DBA by completing the Business License Application online.

You can also mail the completed form to:

• State of Washington—Corporations Division
• Business Licensing Service
• P.O. Box 9034
• Olympia, WA 98507-9034

Suppose you need more time to be ready to file your LLC Articles of Organization but want to secure your chosen LLC name.

You can reserve your LLC name in Washington by filing a Name Reservation form with the Secretary of State, completing the name reservation form, and paying the $30 fee.

You can also trademark your name to stop other businesses from using it in Washington and nationwide.

Search the US Patent and Trademark Office (USPTO) database search tool to confirm that your name is available and that no other business has already marked it. If they have, you can’t use it without risking trademark infringement.

Lastly, perform a domain search to see if your chosen name is available for your website and online branding and marketing strategies.

Search for domains using a domain check and registration website like GoDaddy. If the .com extension isn’t available, consider using .co, .net, or .io, which are almost as popular as .com.

Now that you know how to do a business entity search in Washington, you can take the first step toward starting your Evergreen State LLC.

If you find your desired name isn’t available, don’t worry—there are many ways to come up with a great business name, especially one that works brilliantly as a domain!

If filing your Articles of Organization, hiring a registered agent, registering a trademark, and buying a domain sound like hard work, check out an LLC formation service, which can do all those for you.