In today's world, the needs for transportation have increased and the existing solutions have become insufficient in response to the demand especially with the increase of urban life and the widespread urbanisation. For this reason, local authorities aim to improve urban public transportation services, one of the effective in-city transportation solutions, in order to solve the current needs of transport and reduce or regulate the current traffic intensity. In this study, geographical information system (GIS) was used to analyse the relationship between the bus routes and related stops being offered by Sakarya Metropolitan Municipality (SBB) public transportation service along with the population living in the region to evaluate the level of available current service to the population in each region. An alternative optimisation for the locations of bus stops was presented through a proposed model by comparing the results obtained from the existing positions.