Washington LLC Name Search and Naming Rules

Washington's business name records live in the Secretary of State's Corporations & Charities Filing System (CCFS), which you can search at ccfs.sos.wa.gov. The Corporation Search is public and doesn't require a login. This is the authoritative place to check whether a name is already taken by a registered business in Washington.

Running the search

Enter your proposed name and review the results. Then (and this is the part people skip) search variations of it. Try the name without the LLC designator, with common misspellings, with and without filler words, and with obvious singular/plural swaps. You are trying to find anything close enough that the state might consider it too similar to yours.

A CCFS search tells you what already exists, but it does not guarantee approval. The final call on whether your name is "distinguishable" from existing names rests with the Corporations & Charities Division when you file. A careful search dramatically lowers the odds of a rejection, but it is not a formal pre-clearance.

Washington requires your LLC name to be distinguishable on the records from other business names already registered in the state. This is a legal standard, and it is stricter than most people expect.

What usually does not make a name distinguishable

• Adding or removing punctuation, spacing, or capitalization
• Adding filler words like "the," "a," or "and"
• Switching between singular and plural of the same word
• Changing only the entity designator (for example, "LLC" versus "Inc.") when the distinctive part of the name is identical
• Spelling out a number versus using the numeral (for example, "Three" versus "3")

What generally does make a name distinguishable

• A genuinely different distinctive word or phrase in the name
• A meaningfully different combination of words, not just a rearrangement of the same ones

The safest approach is to choose a name whose distinctive element is clearly its own, not a near-twin of something already on file. If your first choice is close to an existing name, it is better to adjust now than to have the Certificate of Formation rejected and have to refile.

Washington has specific rules about what your LLC name must and must not include.

Required designator

Under RCW 23.95.305, your LLC name must contain one of these designators:

• Limited Liability Company
• Limited Liability Co.
• L.L.C.
• LLC

For a Professional Limited Liability Company, the name must reflect its professional status (for example, using "PLLC"), and additional licensing rules apply.

Prohibited words

The Secretary of State's filing instructions list words an LLC name can't contain:

• "Bank," "banking," "banker," "trust" or "cooperative"
• "Industrial" combined with "loan"
• "Building," "savings," "loan" or "home" combined with "association" or "society"

These words are tied to regulated financial institutions, so an ordinary LLC can't use them. Professional titles and terms may also be restricted to entities actually licensed to provide those services. When in doubt about a word, it is worth confirming the requirement before filing rather than having the name bounced back.

If you have found an available name but are not ready to file the Certificate of Formation yet, Washington lets you reserve an available name through the Secretary of State. The fee is $30, and under RCW 23.95.310 the reservation lasts 180 days. A reservation holds the name so no one else can register it while you get your other pieces in order.

A name reservation does not form the LLC. It only holds the name. Most people skip reservation entirely, because once they have confirmed availability they simply go ahead and file, which is faster and locks in the name by actually creating the entity. Reservation makes sense mainly when there is a real reason for delay, such as waiting on a co-owner or lining up financing, and you want to be sure the name is still there when you are ready.

Clearing your name in CCFS confirms it is available as a Washington entity name, but that is not the whole story. A truly clear name should work across a few dimensions.

Trademarks

A name being available in Washington's business registry does not mean it is free of trademark conflicts. Someone could hold a state or federal trademark on a similar name in your industry, and using it could invite a dispute even though the Secretary of State let you register. For a name you plan to invest in heavily, a trademark search (and possibly registration) is worth considering, ideally with a trademark attorney.

Domain and social handles

Check whether the matching domain name and social media handles are available before you commit. A perfect legal name is less useful if the web presence is taken. Many owners settle on their final name only after confirming they can get a reasonable domain to go with it.

Trade names (DBAs)

If you want to operate under a name different from your LLC's legal name, Washington handles trade names through the Department of Revenue's Business Licensing Service rather than the Secretary of State. Registering a trade name lets your LLC do business under a brand name while the legal entity keeps its formal name. This is a separate, optional step from choosing and clearing your LLC's legal name.

How Mainstay Filing helps

When you form your LLC with Mainstay Filing, we check your name's availability as part of preparing your Certificate of Formation, so you are not filing blind. We handle the state-facing naming mechanics; trademark clearance and branding decisions are yours to make, ideally with the right advisors for anything you plan to build a serious brand around.