This paper analyses spatial differences in the voting results in Poland in the 2015 parliamentary elections. Eleven clusters defining different support profiles are determined using the two most popular stopping rules. Parameters of the multinomial logit model are estimated and determinants of Polish communes' membership in specific clusters are identified. The results of the estimation indicate that economic, sociodemographic and location variables strongly determined the Poles' electoral preferences. However, historical and cultural factors turned out to be the most important determinants.