Haderslev County was established in 1920 following the reunification of Denmark and South Jutland following the Schleswig Plebiscites. It was dissolved in 1970 when it merged with three other counties to form South Jutland County.
The creation of Haderslev County in 1920 was a result of Denmark's reunification with South Jutland following the Schleswig Plebiscites. Its subsequent dissolution in 1970 marked its integration into the new South Jutland County.