Zeyn ol Hajjilu (Persian: زين الحاجيلو, also Romanized as Zeyn ol Ḩājjīlū and Zīn al Ḩājjīlū'; also known as Zeynāl Āghāj)[1] is a village in Shurakat-e Jonubi Rural District, Ilkhchi District, Osku County, East Azerbaijan Province, Iran.

At the 2006 census, its population was 1,443, in 357 families.

[2] This Osku County location article is a stub.

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