The aim of the paper was to determine a group of plant species whose distribution is highly correlated with the urbanization pattern in Poland. For this purpose the atlas of species distribution in Poland providing about 2300 cartograms was used. The population density was taken as an urbanization marker. By means of χ2-test and the linear correlation coefficient species whose distribution was highly correlated with population density were selected. The raw list of species was consequently narrowed down to alien taxa, which did not reach the limits of their distribution in Poland. Species proposed as urban indicators have a continental character as well as high light and temperature requirements. Distributions of nine such species were mapped. Some synthetic variables showing cumulative distribution (referred to as mean and sum) proved to be even better urban indicators. The urbanophiles determined for Warsaw and cities from the western part of central Europe shared about 50% of the species.