The City of Hanover was not part of the district until 2001, when the old Hanover District and the city (then known officially as Kreisfreie Stadt Hannover, which means "District Free city of Hanover") were merged in order to form the new Region Hannover district (not to be confused with the former Regierungsbezirk Hannover).
Hannoveri linn ei olnud regiooni osa enne 2001. aastat, kui vana Hannoveri kreis ja linn (siis ametlikult Kreisfreie Stadt Hannover, mis tähendab "Hannoveri kreisivaba linna") ühendati, et moodustada uus Region Hannover (mitte segamini ajada endise Regierungsbezirk Hannoveriga).