Document Type


Publication Date



Oregon -- Population -- Statistics, Demographic surveys -- Oregon


This report provides population estimates for Oregon and its counties and cities for the years 1980 through 1993. As mandated by Oregon law, the Center for Population Research and Census at Portland State University, acting on behalf of the State Board of Higher Education, annually estimates the July 1 population for each county and incorporated city in Oregon. These figures are certified on December 15. When certified, the population estimates are used in the allocation of certain state tax revenues to cities and counties.

Oregon's estimated July 1, 1993 population is 3,038,000 which represents about 1.2% of the United States population of 257,900,000. Oregon's population increased 195,679 persons (6.9%) in the 39 months since the last U.S. Decennial Census (April 1, 1990). This rate of increase is almost double that of the United States (3.7%). Oregon's growth rate in the early 1990's is a continuation of the rapid growth experienced in the late 1980's when it also grew at twice the national average.

Oregon's population increase of about 195,700 persons since April 1, 1990 is the result of two factors: natural increase (births minus deaths) and net migration (persons moving to Oregon minus persons leaving Oregon). Natural increase has accounted for about 56,900 new Oregonians and there has been a net in-migration of about 138,800 persons in the 1990's.

Figure 5 shows Oregon's net migration (in-migrants minus out-migrants) from 1981 to 1993. It is evident from this graph that migration can vary from year to year. For example, Oregon experienced a net migration of -30,250 people from 1985 to 1986 whereas between 1986 and 1987 there was a net migration of +13,600 people. The substantial net out-migration occurring in 1982, 1983, and 1986 is reflective of the recession in Oregon in the early 1980's. Conversely, in each year from 1988 to 1993, Oregon had net in-migration of more than 30,000 people.

Figure 1 shows a map of Oregon's July 1, 1993 county population estimates. What is particularly striking about this figure is that the eight most highly populated counties are located on what may be termed the I-5 corridor. These counties (Multnomah, Washington, Clackamas, Marion, Linn, Lane, Douglas, and Jackson) contain 2,162,900 persons or 71 percent of the state's 1993 population. Another example of the uneven population distribution in Oregon is that although half of Oregon's 36 counties are East of the Cascade Range, these counties contain only 391,500 persons or 12.9% of the state's population. The percentage of Oregon's population that is East of the Cascade Range has remained constant over time; in 1980 it was 13.0%.


At the time these reports were compiled, the Population Research Center was known as the Center for Population Research and Census, School of Urban and Public Affairs, Portland State University.

Persistent Identifier