The Municipality covers the following villages: Coppenbrügge was first documented around 1000 in a borderline description of the Bishopric of Hildesheim as Cobbanbrug mentioned.

On March 9, 1062, Emperor Henry IV granted Bishop Hezilo of Hildesheim the forest ban at Coppenbrügge.

The Spiegelburg was built in the valley between Ith and Osterwald on the old army and trade route near a swamp area.

Around 1300, the Spiegelberg donated land to the Carmelites to build their monastery in Marienau, and in 1303 Coppenbrügge Castle was rebuilt.

This originally purely local feud developed into an altercation of Lower Saxon territorial princes, in which also the Counts of Spiegelberg were involved.

1764, the old sulfur spring was renewed in the Coppenbrügger Landwehr and expanded for healing purposes.

Spiegelberg came to the Westphalia in 1810, and the Vienna Congress (1815) brought the county back to the Nassau-Oranien (Netherlands).

In 1875, the Hamelin-Hildesheim railway line was built, and a few years later (1906) Carl Netter founded Sanatorium Lindenbrunn.

In 1969, the sanatorium Lindenbrunn was abandoned by its owners and sold to the association for the care of the severely handicapped.

The indoor pool was also rebuilt and the entire roof area equipped with solar panels.