Khoshab DistrictKhoshab District is a former administrative division of Sabzevar County, Razavi Khorasan province, Iran. Its capital was the city of Soltanabad.HistoryAfter the 2006 National Census, the district was separated from the county in the establishment of Khoshab County.DemographicsPopulationAt the time of the 2006 census, the district's population was 37,600 in 9,944 households.