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The City of Portland captured most growth in the tri-county area, and in the Willamette Valley as a whole, through the 1920s. Portland’s population levelled off after the 1940s, as most growth flowed to other parts of Multnomah, Clackamas, and Washington Counties, and in other communities to the south.
Source: United States Census of Population, various years.
Taylor, Zack, "Figure 7.1 Portland population by zone, 1860-2010.pdf" (2019). Shaping the Metropolis: Institutions and Urbanization in the United States and Canada by Zack Taylor. 22.