The thesis will cover the role of the Zagreb's press in shaping the political culture during the period from 1918 to 1929. That period is unique for introducing universal suffrage for men and the abolition of property census. The policy included a wider strata of society, thus changing the political behavior of the society and initiated the construction of modern political culture. The creation of new patterns of behavior is analyzed through newspapers as modern media. During that period newspapers have become an important transmitter of ideas between political elites and the grassroots population. During that period Zagreb has been a cultural and political center of Croatian Approximately 230 newspapers which have been published in it during that period turned made Zagreb to be the center of Croatian press and the press in what was then the Kingdom of Serbs, Croats and Slovenes. Given that newspapers were the only media available to all strata of society, they can be traced to the way the individual parties represented by their political agenda to its supporters and voters. One of the role of information and political newspaper has just been training and population policy. This paper will analyze how the conversion of complex political party programs via newsletters to voters. Emphasis will be placed in the newspapers of those parties that the elections for the National Assembly and the municipal district and the largest number of votes. The analysis will include issues of distribution of newspapers, which target groups they address a particular newspaper, which represent ideological values, and the impact of newspaper content on the formation of political culture. Since the programs of political parties largely came to the fore the social and economic issues as an important factor in the politics of this period, the lower strata of society.