Tønder County

Tønder County (Danish: Tønder Amt) is a former province in Denmark, located the south-western part of Southern Jutland.

Tønder County was established in 1920 following the reunification of Denmark with South Jutland following the Schleswig Plebiscites.

Tønder County corresponded geographically to the northern part of the former Prussian Kreis Tondern except for Hviding Herred, which had been part of Kreis Hadersleben.

Kreis Tondern had in turn been established in 1867 in order to simplify the intricate administrative structures of the Duchy of Schleswig, and was formed from regions belonging to Ribe County (exclaves of Denmark) and Løgumkloster County (parts of Schleswig).

The rest of the province formed eight new municipalities belonging to South Jutland County:

Tønder County. The areas marked in green became part of South Jutland County in 1970. The three parishes indicated in pink were transferred to Ribe County the same year.