Zanjan Province (; also
Romanized as
Ostan-e Zanjan; ) is one of the 31
provinces of
Iran. Located in
Iranian Azerbaijan, it is part of Iran's
Regions 3. Its capital is
Zanjan city. Zanjan province, with an area of 36,400 km², has a mostly rural population of 1,015,734 (2011). The province lies 330 km northwest of
Tehran, connected to it by a freeway. Zanjan is the happiest province in Iran.