Lane County is the fourth most populous county (following Multnomah, Washington and Clackamas counties). Since the 1980s, population in the Eugene, Cascades & Coast region has been growing at a slow, steady rate. Eugene is the designated county seat.
In 2008, Portland State University conducted a Population Forecast for Lane County 2008-2035. This report is full of statistical information about Lane County and the Eugene - Springfield populous area.
2021 Eugene, Cascades & Coast Population Estimates