This is a prospective study of 270 patients presented with renal stone over four years. Side of the renal stone whether in left kidney or right kidney was considered. The size of the stone was measured by imaging techniques (ultrasound or by CT scan) in 166 patients, in the remaining 104 patients imaging was done only for diagnosis, but without measuring the renal stone size (for different reasons). Residency was considered as urban or rural for any of these patients. The study shows that urban residency has increased risk for developing renal stone (63.7%) as compared to rural areas (37.3%), this effect was clearly significant for stone size between 1-2 centimeters