​​​​This guide includes a comprehensive descriptive inventory of selected records for each of Oregon's 36 counties. The inventory listings describe records available at the State Archives, county offices, local museums and other repositories.

Records held by the counties, the Oregon State Archives and others. This section includes an explanation of how the records series descriptions are compiled​​​​​​​​​​​.

Project history for the Oregon Historical County Records Guide including inventory parameters and descriptions of records.​