The objective of the present study is to determine the transparency level of Rio Grande do Sul state’s municipalities, identifying the variables that explain it. This is a documental and quantitative research, observing the most recent information disclosed in the state’s transparency websites, identifying if the data disclosure is correct, through the Municipal Public Management’s Transparency Index, as well as the regression analysis and descriptive statistics. In this way, it is possible to observe that most state’s municipalities present an average level of transparency. Besides, it was observed that, from the eleven socioeconomical variables that were analyzed, only five are capable of influencing the transparency index. Therefore, many measures must still be adopted by the state’s municipal managements, so that they enforce the Access to Information Law and fulfill all of the aspects that come from the transparency.