Rensselaer County, NY
History
The county was not organized as a legal entity until after the Revolution, in 1791, when it was created from an area that was originally part of the very large Albany County.In 1807, in a county re-organization, the rural sections of Troy were set off as Towns, and the city was incorporated. The two towns created were Brunswick (named for Duke Friedrich Wilhelm of Braunschweig-Lüneburg) and Grafton (named for Henry FitzRoy, 5th Duke of Grafton). A third town, Philipstown, was set off in 1806. In 1808, it was renamed Nassau after the duke of that area.
Source: Wikipedia
Modern Day Adjacent Counties
Washington County — northBennington County, Vermont — northeast
Berkshire County, Massachusetts — east
Columbia County — south
Greene County — southwest
Albany County — west
Saratoga County — northwest