Summary: Anyone doing business in Seattle must have a Seattle business license tax certificate, also known as a business license or general business license. This Seattle business license is separate from your Washington State Business License. Typically, the Seattle business license customer number is 6 digits in length and can be found in one of two ways:
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On Your Business License Tax Certificate
The Seattle Business License Customer number is 6 digits in length and listed on the top of the Business License Tax Certificate. The leading zeros are not included in the license number. Please see the example below to locate your customer number.
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Using the City of Seattle Lookup Tool
The City of Seattle maintains a publicly available lookup tool on seattle.gov. Please use the hyperlink below to access the tool. The tool will prompt for specific information to search for your business license customer number.
https://www.seattle.gov/city-finance/business-taxes-and-licenses/find-a-licensed-business