Although its population is small, it gained city rights in 1333. Castle Twickel is a famous landmark near Delden and the Baron van Heeckeren of Twickel built a watertower in Delden. While drilling for water, the Baron's men discovered salt, which started the salt industry in the region of Twente.
In 2009, the city had a population of 7,080.
Before it became a part of Hof van Twente in 2001, Delden consisted of two municipalities: Stad Delden (the city itself), and Ambt Delden (the surrounding countryside). These municipalities had existed since 1818, when the original municipality "Delden" was divided into two parts.
Twente (English: Twenthe, Dutch: Twente, Dutch Low Saxon: Twente. Tweante) is a non-administrative region in the eastern Netherlands. It encompasses the most urbanised and easternmost part of the province of Overijssel. Twente is most likely named after the Tuihanti or Tvihanti, a Germanic tribe that settled in the area and was mentioned by the Roman historian Tacitus.
The region's borders are defined by the Overijssel region of Salland in the northwest and west (the river Regge roughtly defines the western border), the German County of Bentheim in the northeast and east (the river Dinkel roughly defines the eastern border) and the Gelderland region of the Achterhoek in the south.