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Become a Member

Thank you for your interest in becoming a member of 501 Commons. Please fill out the online membership form below. You’ll need the following information:
  • Basics: address, primary contact, billing contact and executive director's name
  • Your Tax ID Number (or EIN)
  • Your annual budget (to determine your dues based on our sliding fee scale - this amount can be found on line 12 of your most recent IRS 990 Form)

When you've completed the form, press “Submit”. You will receive an invoice with payment options. Questions? Don't hesitate to send us an email us at or call us at 206-682-6704.

Privacy Statement: 501 Commons respects your right to privacy. We promise that ALL information you share with us on this form is for 501 Commons' use only. We will NEVER sell, rent, loan, trade, or otherwise transfer any information collected on our site.
Organization Information
Enter the official name of your organization; please do not use acronyms or abbreviations.
Please enter your Employer Identification Number or Tax ID Number.
Please note the approximate number of employees (including anyone working 10 hrs./wk. or more).
Please describe the mission of your agency.
Membership Information
501 Commons membership fees are based on your annual operating budget.
Please enter numbers only (example: 600000).
Following are the sliding scale fees based on budget:
Annual Operating Budget RangeMembership Fee
Under $100,000
$100,000 - $499,999
$500,000 - $1,499,999
$1,500,000 - $4,999,999
$5,000,000 or more
Invoice sent to Billing Contact
Membership Contact
Please let us know the name of the person we should contact for projects, membership status, or general questions.

Membership Billing Contact
Executive Director

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