Masumabad (Persian: معصوم اباد)[a] is a village in, and the capital of, Mirbag-e Shomali Rural District of Mirbag District, Delfan County, Lorestan province, Iran.

[4] At the time of the 2006 National Census, the village's population was 530 in 107 households, when it was in the Central District.

[6] The following census in 2011 counted 589 people in 137 households.

[7] The 2016 census measured the population of the village as 624 people in 160 households.

This Delfan County location article is a stub.