Description: The boundary controls urban expansion onto farm and forest lands. Metro is responsible for managing the Portland metropolitan region's urban growth boundary and is required by state law to have a 20-year supply of land for future residential development inside the boundary.
Description: Incorporated city boundaries in and around the Portland metropolitan area, derived from Boundary Commission and Oregon Secretary of State filed annexations.
Description: Clackamas, Clark, Multnomah, Washington, Polk, Columbia, Marion and Yamhill county boundaries in Oregon and Clark, Cowlitz, Skamania county boundaries in Washington.