 The town's name was changed into "Słupsk" (the historic Polish version of its name) by the Commission for the Determination of Place Names on 23 April 1945.It was initially part of "Okręg III", comprising the whole territory of the former Province of Pomerania east of the Oder River.Słupsk later became part of Szczecin Voivodeship and then Koszalin Voivodeship, and in 1975 became the capital of the new province of Słupsk Voivodeship.