You are likely looking for small towns or village rather than cities.
I can tell you that Račinovci (pop. 691) located in Vukovarsko-Srijemska Zupanija (County) 157.3 miles ESE of Zagreb very close to the point where the borders of Croatia, Bosnia and Serbia come together
http://www.mapquest.com/?le=t&q=44.8639%2C18.9553&zo...=
Yugoslavia did not exist until after 1918, when WW I ended. Prior to this The Kingdom of Croatia and Slavonia was under the rule of the Austro-Hungarian Empire and Srijem extended farther East than it does today, the eastern part became part of Serbia at that time. If you click on the link below you will find a map of old Srijem. You will find Racinovici just below the O in the word Jugoslawien
http://www.dvhh.org/syrmia/images/syrmia-slavonia-kopp.jpgHere is a link to "Danube-Schwabian" ancestry page, which may help you.
http://www.dvhh.org/syrmia/The LDS FamilyHistory has recently placed over 1.4 million pages of records for Croatian churches and synagogues online, including the Roman Catholic Church at Racinovici! YYOu may access them at no charge at the link below, however you will need to sign up.
https://familysearch.org/search/collection/list#page=1&c...
Robert Jerin
Croatian Heritage Museum
Cleveland Ohio