The County of Loon (Dutch: Graafschap Loon, French: Comté de Looz) is a state of the Holy Roman Empire, lying west of the Meuse river in present-day Flemish-speaking Belgium, and east of the old Duchy of Brabant.
The most important cities (bonnes villes) of the county are Beringen, Bilzen, Borgloon, Bree, Hamont, Hasselt, Herk-de-Stad, Maaseik, Peer and Stokkem.
Its territory correspondsclosely to that of the current Belgian province of Limburg.
Like other areas which eventually come under the power of the Prince Bishop of Liège, Loon does not become politically linked with the rest of Belgium until the French revolution, but these events also bring the county to an end.
Under various new names, it first becomes part of France, and then of the United Kingdom of the Netherlands, before finally joining the new kingdom of Belgium definitively in 1839.The original center of this county before it expands is Borgloon, originally just called Loon, in the southern part of the county.
This part of the county is geographically in the hilly Belgian region known as Hesbaye in French or Haspengouw in Dutch.
It later expandd northwards into the low-lying Campine or Kempen region which was known as Toxandria in the early Middle Ages.
