Transportation is an important factor in the connectivity of a space and the functioning of everyday life and mobility of the population living in it. The development of transportation affects the availability of the services of a space and the realization of the opportunities it provides. This is often reflected in everyday life and therefore the poorer development of transportation can be the cause of the negative demographic trends that the City of Trilj has recorded in recent years. The aim of this paper was to investigate the impact of transportation on the demographic processes of the City of Trilj. In order to achieve the goal, it explored in more detail the transport-geographical characteristics of the City, as well as the attitudes of the local population about the impact of transportation on their daily lives, all in relation to the impact of transportation on the demographic characteristics of the study area. There was an aspect of spatial differentiation of respondents living in the city center and peripheral area. At the end of the paper, possible proposals for the improvement of transportation characteristics that would have a positive impact on the demographic characteristics of the City of Trilj were presented. The methodology of this paper is consisted of analysis of professional and scientific literature, analysis of statistical data, qualitative interviewing methods and cartographic visualization presented using GIS.