Hesar (Persian: حصار)[a] is a village in, and the capital of, Chaypareh-ye Pain Rural District in Zanjanrud District of Zanjan County, Zanjan province, Iran.

[4] At the time of the 2006 National Census, the village's population was 731 in 193 households.

[5] The following census in 2011 counted 651 people in 193 households.

[6] The 2016 census measured the population of the village as 551 people in 179 households.

This Zanjan County location article is a stub.