ComplianceApril 14, 2026

How to conduct a Washington state business name search

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If you're planning to form your Washington LLC or corporation (which is sometimes referred to as “registering your business”), you’ll need to file a Certificate of Formation to form an LLC or Articles of Incorporation to form a corporation. These documents are filed with the Washington Secretary of State.

Before you file those documents, you need to choose a name for the LLC or corporation. The name that appears on the LLC’s Certificate of Formation or corporation’s Articles of Incorporation is its “legal name”.

And before filing with the state, it's a good idea to check whether the legal business name you want is available.

Washington state has rules on what you can name your LLC or corporation

Choosing a business name is one of the most important decisions for business owners. Your business name creates the first impression for customers, investors, partners, and potential employees. It can be frustrating to find the right name only to learn it is already taken when you try to register your business with the Washington Secretary of State.

As with other states, Washington has rules on what you can name an LLC or corporation.

The name of the LLC or corporation must be distinguishable in the records of the Washington Secretary of State from the name of any existing domestic entity that is not currently administratively dissolved, any foreign entity registered to do business in the state, or any name that has been reserved or registered by either a domestic or foreign entity.

A name is not considered distinguishable if it differs only by minor formatting or wording changes, such as:

  • Business entity identifiers: For example, “Blue Horizon LLC” vs. “Blue Horizon Inc”. The difference in the entity suffix alone does not make these names distinguishable.
  • Article and conjunctions: For example, “The Garden Market” and “Garden Market” are not distinguishable.
  • Punctuation and capitalization: Names like "Bright-Star Marketing LLC" and "Bright Star Marketing LLC" are not distinguishable when punctuation, capitalization, or special characters are altered.
  • Abbreviations or pluralizations: For example, "Mountain Peak Service" and "Mountain Peak Services" are not distinguishable based on the use of abbreviations or plural forms.

When determining if a business name is available, the Washington Secretary of State’s office only looks at names of entities registered with them. If you violate naming rules, your LLC or corporation might have its Certificate of Formation or Articles of Incorporation rejected.

When choosing a name for your Washington business, consider more than just its availability with the Secretary of State. You also need to be careful not to pick a name that is already trademarked.

If you choose a trademarked name, the owner might accuse you of “trademark infringement” or “unfair competition.” If that happens, you could be taken to court, forced to change your business name, and possibly pay damages.

When you file your LLC or corporation documents, the Washington Secretary of State does not check your proposed name against trademark or service mark registrations. So, just because you can form your LLC or corporation under a certain name does not mean there won’t be trademark issues.

About trademarking your Washington business name

When starting a business, you may choose to trademark your business name, but it isn’t required. You can operate under your business name without registering a trademark.

A trademark is a word, name, or symbol that identifies and distinguishes your products or services. For example, Apple’s logo instantly signals the brand when you see it.

Your business name may function as a trademark if you use it in commerce to identify your goods or services. While you can gain some trademark rights without registering with the U.S. Patent and Trademark Office (USPTO), federal registration provides stronger protection, especially if someone else tries to use your name.

In addition to federal registration, Washington allows you to register a trademark at the state level. This gives you exclusive rights within the state and helps protect against infringement locally.

It’s also worth noting that the Washington Secretary of State does not record trade names. (Trade names are registered with the Department of Revenue.) However, if a trade name is used to identify goods or services in commerce, it may qualify for trademark protection and can be registered as a trademark.

How to find if a business name is taken

Checking the availability of a business name early on can help you avoid costly mistakes and keep your launch on schedule. There isn't a single resource to search for conflicting business names for your Washington LLC or corporation, so it's best to use various methods to ensure you cover all your bases.

1. Check the internet

Enter a name you are considering into a search engine to see if anyone else is using a similar name for comparable products or services. Additionally, check if the website domain name you want is available by typing the name into the search bar and pressing enter. You can also use the ICANN WHOIS Lookup tool for this. ICANN manages all domain names.

2. Search the Washington Secretary of State Business Entity Database

Visit the Washington Secretary of State's Corporations & Charities Division page to search for the names of LLCs, corporations, and other formal entities that are registered.

Scroll down to find the "Corporation Search" box. Enter the full name of the business you’re searching for, or use a keyword for broader search results.

The keyword search will pull up names containing the keyword anywhere in the name.

For example, if your desired name is "Helen’s Hampers," searching the keyword "hampers" will return all registered businesses with "hampers" anywhere in their name, such as "Helen’s Hamper Shop LLC," "Helen’s Hampers of Seattle" or "Seattle Basket Company by Helen".

4. Perform a trademark search

Trademark issues can arise if you use a business name that’s already legally protected by someone else. To help avoid this, search for registered trademarks using the USPTO and the Washington Secretary of State’s office. Steps you can take include:

  • Search the free USPTO online trademark database, where you can look for exact matches and similar names. When you search, don’t just look for your exact name. Try common misspellings and variations. Even if your name is not the same as someone else's trademark, they might still object if the names are similar enough to confuse people.
  • Check whether a trademark has been registered in Washington. To register a trademark federally, it must be used in more than one state. If a trademark is used only within Washington, it can only be listed in the state database.
  • Search for state trademarks on the Washington Secretary of State Corporations & Charities Division page. Scroll down past the business entity search box (Corporation Search) to find the trademark search box.

5. Perform a trade name search

An individual or business entity can operate under a name different from its legal name in Washington. You may know that as DBA (doing business as) name, although in Washington it is called a “trade name”. A DBA or trade name allows businesses to present themselves in a more recognizable or marketable way.

In Washington State, you must register your trade name with the Department of Revenue. Trade names are registered by using the Business License Application form. It’s important to choose a business name that isn't already in use by a local competitor, even if the competitor isn't an LLC or corporation. Using a name someone else is already using can cause legal problems and confuse customers. Before you decide on a name, you can check for existing trade names on the Department of Revenue website.

6. Check social media handles

Confirm your business name is available on platforms like Instagram, Facebook, TikTok, LinkedIn, X (Twitter), and Bluesky. Don't forget to check business listing sites like Yelp to ensure your name isn’t already claimed by another local business. You got this!

Tips on selecting a business name for our Washington LLC or corporation

Before choosing a business name, make sure it follows Washington’s naming rules.

  • Include the right words: The name of your LLC or corporation must include specific words or abbreviations that identify the type of entity you are forming. For instance, an LLC name must include "Limited Liability Company," "Limited Liability Co.," or the abbreviation "L.L.C." or "LLC." A corporation’s name must include "corporation," "incorporated," "company," or "limited," or the abbreviation "Corp.," "Inc.," "Co.," or "Ltd.," Also, in Washington, certain words are prohibited, like “Bank” for a corporation or “Cooperative” for an LLC or corporation.
  • Check business name availability: Conduct a business entity search on the Secretary of State's website to determine if there is already a corporation, LLC, or other entity in the Secretary of State’s records with the proposed name. Be sure to check additional sources as well. This will help you avoid having your Certificate of Formation or Articles of Incorporation rejected.
  • Reserve your business name with the state of Washington: You can secure a "lock" on that name through the Washington Secretary of State. This prevents any other entity from forming an LLC or corporation using the same name or reserving the same name until you have filed your Certificate of Formation or Articles of Incorporation. In Washington, a business name reservation expires 180 days after filing, and may not be renewed. A new filing may be made after the expiration date.

Even if the name meets Washington's naming rules, it is also worth doing a trademark search to make sure the name would not infringe on an existing trademark.

For more information, see How to register a business name for your LLC.

Reserve your business name

BizFilings makes it easy to reserve your preferred business name with the state so it’s available when you’re ready. Learn more.

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Can I use a business name that exists in another state?

State Name Reservation Service

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Dave Griswold
Senior Customer Service Operations Associate
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