Welcome To Teamsters Local 231Affiliated with the International Brotherhood of Teamsters.Chartered as a General Local on January 8, 1909, Teamsters Local 231 currently represents over 2400 members with 90 collective bargaining agreements from 70 different employers in Whatcom, Skagit, San Juan and Island Counties. Our members work in a variety of industries including package handling UPS, warehouse, freight, solid waste and recycling, local government, bakery, laundry, construction, food processing, dairy, public school transportation, and more.