Background : Circumcision is to remove the pretium or skin covering the glans penis so that the glans penis becomes open. This action is the most common minor surgery performed in the world, usually done by doctors, paramedics or by circumcision experts or traditional practitioners of circumcision. This circumcision aims as the implementation of religious shariah or for certain medical purposes. In Indonesia, almost all of the male population had done circumcision and most of them was circumcised at the age of 5-18 years. Mass circumcision is often used as a momentum of society with low economic class to get circumcised. This study is needed to describe the demographic characteristics of the mass circumcision participants. Methods : The research was done using descriptive method to 15 children respondents who attended the mass circumcision in RS PKU Muhammadiyah Gamping on 25 December 2016. Result : Obtained from 15 participants of mass circumcision was found 13 children in the age betwen 5-11 years and 2 children in the age betwen 12-16 years. There were 14 children who were Muslim and 1 was Catholic. The nutritional status of the participants found that 11 children had normal nutritional status, while for the rest was very thin 1 children, underweight 1 children, overweight 1 children and obese 1 children. For the economic status of the participants in terms of parental income there are 10 people in the lower economic class and 5 participants of upper class economic status. Conclusion : There is a conformity of data with previous research on the age and religion of respondents. However, there are differences in the results of the data with previous studies on the socio-economic status of the participants.