Metro - Historical census tracts, up to date block data, access to shapefiles used in their Regional Land Information System (RLIS), user manual for the system is also available.
City of Portland's Bureau of Technology Services's Data Catalog - A wide range of street and lot information (curbs, street vegetation, tax-lots, etc) as well as zoning and bike facilities and more.
PSU's Geography Dept GIS portal has a great number of links to more data sources.
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