Introduction: There are more than 150 active Peritoneal Dialysis (PD) patients in Al-Zahra medical center in Isfahan. This center has been working since 2000. We evaluated DEMOGRAPHIC CHARACTERISTICS of our PD patients: Methods: It is an observational descriptive study done in 2011. The information was collected from all patients’ records in Al-Zahra medical center until end of 2009.Results: 1) Out of 240 patients, the mean age was 48 ± 21 years.2) 57% of patients were male.3) Diabetes mellitus, hypertension, and glomerulonephritis were the most common cause of chronic kidney disease, 44%, 30%, and 4%, respectively.4) The most common age group was the 7th decade (22.5%) and the least common age group was the 2nd decade (5%).5) 27% of patients were single. We do not have information about divorced and unmarried patients.6) The level of patients’ education was 38%, 38%, and 24% for illiterate, under diploma, and diploma or university education, respectively.7) The number of co-morbid diseases (cardiovascular, diabetes mellitus, etc.) in our patients was 13%, 41%, 25%, 15% for none, one, two and three co-morbid diseases, respectively.8) History of hemodialysis: 54% had history of hemodialysis equal or less than 6 times.9) Body mass index of our patients<19, 19 to 25, 26 to 30, and>30, were 15%, 51%, 29%, and 5%, respectively.10) In 77% of our patients, peritoneal dialysis was the first choice for renal replacement therapy.11) PD was used as renal replacement therapy as a positive selection for 85% of patients.Conclusions: PD was the first choice of renal replacement therapy in most of our PD patients and used as a positive selection. It shows that PD has become a popular form of renal replacement therapy and we need more PD centers to cover patients.