The Wołyń Voivodeship was created formally on 19 February 1921.
It was initially divided into the counties of Dubno, Horochow, Kowel, Krzemieniec, Luboml, Łuck, Ostróg, Równe and Włodzimierz Wołyński.
On 1 January 1925 the gminas of Zdołbunów and Zdołbica of Równe country and gminas of Buderaż and Mizocz of Dubno one were passed to one of Ostróg.
Center of Ostróg one was moved to Zdołbunów and was renamed as Zdołbunów one.
Also gminas of Bereźne, Derażne, Kostopol, Ludwipol, Stepań and Stydyń were detached from country of Równe and one of Kostopol was formed.
At same arrangements Majków gmina of Ostróg was passed to Równe one, Beresteczko gmina of Dubno one was passed to Horochow one, Ołyka gmina of Dubno one was passed to Łuck one, Radziwiłłów gmina of Krzemieniec was passed to Dubno one.
The Wołyń Voivodeship was created formally on 19 February 1921. It was initially divided into the counties of Dubno, Horochow, Kowel, Krzemieniec, Luboml, Łuck, Ostróg, Równe and Włodzimierz Wołyński. On 1 January 1925 the gminas of Zdołbunów and Zdołbica of Równe country and gminas of Buderaż and Mizocz of Dubno one were passed to one of Ostróg. Center of Ostróg one was moved to Zdołbunów and was renamed as Zdołbunów one. Also gminas of Bereźne, Derażne, Kostopol, Ludwipol, Stepań and Stydyń were detached from country of Równe and one of Kostopol was formed. At same arrangements Majków gmina of Ostróg was passed to Równe one, Beresteczko gmina of Dubno one was passed to Horochow one, Ołyka gmina of Dubno one was passed to Łuck one, Radziwiłłów gmina of Krzemieniec was passed to Dubno one.
Wołyń Voivodeship (1921–1939)