Thank you to everyone who responded. You will find my compiled list of organizations as an image below (limited size due to web format) or by downloading the full Excel document.
VOLUNTEER GROUP REFERRAL LIST – EXCEL *Additional notes are on the 2nd worksheet.
This is by no means an all encompassing list but it’s somewhere to start. You can also check out the United Way of King County’s volunteer opportunities as they have a filter to show volunteer opportunities for groups of 3 or more – HERE.