- Crook County, Oregon has 2,978.9 square miles of land area and is the 12th largest county in Oregon by total area. Crook County, Oregon is bordered by Wheeler County, Oregon, Grant County, Oregon, Jefferson County, Oregon, Deschutes County, Oregon, and Harney County, Oregon.
- Sherman County, Oregon (data.census.gov)
Sherman County, Oregon has 823.6 square miles of land area and is the 29th largest county in Oregon by total area. Sherman County, Oregon is bordered by Gilliam County, Oregon, Wasco County, Oregon, and Klickitat County, Washington.