County
County in Project-GC refers to the largest administrative divisions of a state/province/region of a country. Geocaching.com does not show counties, Project-GC uses Administrative boundaries from OpenStreetMap via OSM-Boundaries and for some countries official government data to determine the county of a cache.
Related statistics
Counties can be are shown in the Maps tab of the Profile Stats when toggled with the button labeled counties and logging all the counties in a country awards the country badge in the BadgeGen tab with a checkmark-addon.
Top County Finders is a top list that shows who have logged the most counties.
Related paid membership features
Map Counties is a tool where users with a paid membership can find what counties they have found or not found caches in and what caches are available in the counties.