Mohammadabad () is a village in Zam Rural District of Pain Jam District in Torbat-e Jam County, Razavi Khorasan province, Iran.
At the time of the 2006 National Census, the village's population was 1,684 in 345 households. The following census in 2011 counted 2,037 people in 459 households. The 2016 census measured the population of the village as 2,091 people in 508 households, the most populous in its rural district.