"...Since its establishment in July 2012, following the onset of the Syria crisis, the population of Zaatari camp has experienced regular fluctuations due to temporary and permanent movements into and out of the camp. UNHCR monitors the camp population through regular analysis of the number of individuals registered in the camp. This information, which is updated at least once a month, fluctuates according to the number of new arrivals, formal departures, deaths, and births in the camp. It is key for guiding camp-wide programming and planning the provision of services and assistance to the community. To complement UNHCR’s comprehensive monitoring of Zaatari camp’s population, UNICEF, in collaboration with REACH, conducts population counts to provide UNICEF a detailed demographic and spatial breakdown of the camp population at the district and block level2 at a single point in time. To date, six population counts have been conducted in Zaatari camp, the first of which occurred in May/June 2013 and the most recent in December 2015. UNICEF requires up to date and accurate population data for cost and implementation efficacy. Block level data is particularly important, since much WASH programming is conducted at the block level, including the delivery of water across the camp and planning for the implementation of a waste water network. REACH, in partnership with UNICEF, conducted a population count on 13-23 December 2015. In order to reflect the priority information needs of UNICEF and its partners, the population count also included questions about intentions to leave the camp, attendance of informal and formal education, the condition of private WASH facilities, and the presence of household members with restricted mobility..."

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(source : www.data.unhcr.org)