county -
(United Kingdom) a region created by territorial division for the purpose of local government; "the county has a population of 12,345 people"
region,
part a knowledge domain that you are interested in or are communicating about; "it was a limited realm of discourse"; "here we enter the region of opinion"; "the realm of the occult"
county -
A definitive geographic region, without direct administrative functions, as in traditional county.
Wikipedia
A county is a land area of local government within a country. A county may have cities and towns within its area. Originally, in continental Europe, a county (contea or contado, comté, comtat, condado, Grafschaft, Gau) was the land under the jurisdiction of a count.
OmegaWiki Dictionary
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county An area comprising more than one city and whose boundaries have been designed according to some biological, political, administrative, economic, demographic criteria.
county The land under the jurisdiction of a count.