The Central District of Ijrud County () is in Zanjan province, Iran. Its capital is the city of Zarrinabad.
At the time of the 2006 National Census, the district's population was 29,319 in 7,351 households. The following census in 2011 counted 31,656 people in 8,906 households. The 2016 census measured the population of the district as 30,493 inhabitants in 9,341 households.