The OSTF is comprised of members representing these interest groups and stakeholders consistent with its scale and countywide focus:
- Association of Realtors
- Cascade Land Conservancy, Chambers /Clover Creeks Watershed Council, Clover Creek Council, Conservation Futures Program Citizens' Advisory Board
- Farming Assistant, Revitalization & Marketing Board, ForeverGreen Council, Friends of Pierce County, Friends of the Hylebos
- Greater Peninsula Conservancy, Key Peninsula Metropolitan Park District, Metropolitan Park District of Tacoma, and Peninsula Metropolitan Park District
- Master Builders Association
- Nisqually Land Trust, Nisqually River Council, Pierce Conservation District
- Pierce County Council, Pierce County Parks and Recreation Citizens' Advisory Board, Pierce County Sustainability Coalition
- Puyallup River Watershed Council
- Tahoma Audubon
- Tribes