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At the time of the 2006 National Census, Darjazin's population was 4,370 in 1,108 households, when it was a village in Chashm Rural District of the former Mehdishahr District of Semnan County. The following census in 2011 counted 4,964 people in 1,359 households. by which time the district had been separated from the county in the establishment of Mehdishahr County. Darjazin Rural District was created in the new Central District, and Chasm Rural District was transferred to the new Shahmirzad District. The village of Darjazin was elevated to the status of a city in the Central District. The 2016 census measured the population of the city as 5,997 people in 1,777 households.
Darjazin can be found at GEOnet Names Server, at this link, by opening the Advanced Search box, entering "-3059497" in the "Unique Feature Id" form, and clicking on "Search Database".