This project is funded by the State of Oregon through the Department of Land Conservation and Development (DLCD).
Oregon -- Population -- Statistics, Demographic surveys -- Oregon, Population forecasting -- Oregon -- Gilliam County
Gilliam County’s total population declined during the 2000s, with average annual growth rate of negative two-tenths of one percent (Figure 1); however, since 2010 the county has seen a slight increase in population, growing by more than 100 persons between 2010 and 2015 (Figure 2).
Gilliam County’s population decline in the 2000s was the result of a steady natural decrease and periods of net out-migration (Figure 12). The larger number of deaths relative to births has led to a natural decrease in nearly every year from 2000 to 2010. While net in-migration fluctuated during the early and middle years of the last decade, the number of in-migrants has been increased stably during recent years, contributing to population increase since 2009.
Total population in Gilliam County as a whole is expected to increase over the forecast period, with the majority of this growth occurring within Arlington UGB (Figure 1). Increasing net in-migration is expected to offset the growth in the natural decrease throughout the entire 50-year forecast period.
An aging population in the near-term is expected to not only lead to an increase in deaths, but a smaller proportion of women in their childbearing years will likely result in a steady number of births. During the final 31 years of the forecast period, the population is expected to shift toward younger ages leading to more births and a steady number of deaths. This combined with steady net in-migration is expected to lead to continued steady population growth.
Portland State University. Population Research Center; Ruan, Xiaomin; Proehl, Risa; Jurjevich, Jason R.; Rancik, Kevin; Kessi, Janai; Tetrick, David; and Michel, Julia, "Coordinated Population Forecast for Gilliam County, its Urban Growth Boundaries (UGB), and Area Outside UGBs 2016-2066" (2016). Oregon Population Forecast Program. 23.