Kotor-Varoš was a srez (a second-level administrative unit) centered at Kotor Varoš, that existed during the Kingdom of Yugoslavia and Socialist Yugoslavia. It had earlier been a kreis of Austro-Hungarian Bosnia and Herzegovina. It was a subdivision of the Vrbas Oblast in 1922–29, Vrbas Banovina in 1929–41, and thereafter the Socialist Republic of Bosnia and Herzegovina. It was abolished in 1955.Statistički godišnjak SFRJ (1955): Srezovi i opštine u NR BiH.
In 1948Statistički godišnjak SFRJ (1948): Srezovi i opštine u NR BiH. and 1953, it included the six municipalities of Kotor Varoš, Previle, Skender Vakuf, Šiprage, Vrbanjci and Zabrđe.
Demographics 1953 Census area Total SerbsCroats Slovenians Macedonians Montenegrins Yugoslavsundecided Czechs Poles Rusyns–Ukrainians Other Slavs Other non-Slavs KOTOR VAROŠ COUNTY37898250086485 441063752 –2 –8Kotor Varoš4715805264023612531 – 1 –4Maslovare457439668–––600–––––Preville45763537696–––342––––1Skender Vakuf7100656616–––518–––––Šiprage774660362411–1682––––2Vrbanjci4919167817281–415051–1–1 Zabrđe426824201373–––475–––––
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