In this paper, a gravity model is used to capture urban influences in a single variable that combined urban population and distance to urban centers. The model was developed under the theory that urbanization pressures increase as population increases and distances from the urban center decrease. The data were gathered by the questionnaires of investment areas of several natural gas pipeline projects in eight different cities of Turkey. The results suggest that both land rents and urban influences have been important factors affecting the farmland prices. © 2008 ASCE.