Annual Oregon Population Report and Supplements from the Center for Population Research and Census at Portland State University. Contains official population estimates for Oregon and its counties and cities.
Oregon Survey Research Laboratory : A University of Oregon research that designs and conducts surveys on selected target populations. The OSRL closed in June 2005, but the data is now collected at the UO Libraries' Scholar's Bank.
United States
CensusScope. From the Social Science Data Analysis Network at the University of Michigan.
Census State Data Centers. Links to the various coordinating agencies for the Census Bureau's State Data Center Program. They are useful sources of information at the state and local level.
Poverty and Homelessness (Dept. of Housing and Urban Development). Various publications, including the results of the National Survey of Homeless Assistance Providers and Clients.
Population Reference Bureau's Datafinder. Contains population and health data on 95 demographic variables for more than 220 countries, 28 world regions and sub-regions, the world as a whole, the United States as a whole, and the U.S. states.