United States counties and county equivalents in Oregon

A county is a type of officially recognized geographical division within a state, both federal and sovereign, or province. Counties are defined in diverse ways, but they are typically current or former official administrative divisions within systems of local government, and in this sense counties are similar to shires, and typically larger than municipalities. Various non-English terms can be translated as "county" or "shire" in other languages, and in English new terms with less historical connection have been invented such as "council area" and "local government district". On the other hand, in older English-speaking countries the word can still refer to traditional historical regions such as some of those which exist in England, Scotland, Wales, and Ireland. The term is also sometimes used for districts with specific non-governmental purposes such as courts, or land registration.
Wikipedia