The United States Census Bureau collects data and information on populations and demographics across all 50 states in the US. According to their Quick Facts about Oregon, the state has had a population of 3,825,657 people as of 2009. These are, of course, esimates based on Census data and may have changed since 2009.
The Census Bureau reports that Oregon's population (of just over 3.8 million people in 2009) represents an 11.8 percent increase in the population since 2000.
In addition to providing information about Oregon's population, the Census Bureau also reports a number of other facts about Oregon including:
More facts about the state of Oregon can be found at the US Census Oregon Quick Facts website, including both personal demographic information and facts about businesses within the state. Census data is updated periodically, so numbes may change and update as the Census collects new information.