Immigration authorities detain noncitizens in 10 main California immigration detention facilities, which housed a total average daily population of 4,594, according to government data through December 5, 2015. In addition to these main facilities, detainees may be placed under ICE detainers and held in other facilities before being transferred to a main immigration detention facility. Between October 1, 2014 and June 30, 2015, ICE detainees were held, at least temporarily, in more than 50 facilities throughout the state.