Hamadan Province, is one of the 31 provinces of Iran. Its center is Hamadan city. The province of Hamadan covers an area of 19,546 km². In the year 1996, Hamadan province had a population of approximately 1.7 million people; according to the National Census held in 2011 the population of the Province was 1,758,268 people.
Other major cities of Hamadan province are: Hamadan, Toyserkan, Nahavand, Malayer, Asad Abad, Bahar, Famenin, Razan and Kabudrahang. The counties of Hamadan Province are Kabudrahang County, Razan County, Famenin County, Bahar County, Hamadan County, Asadabad County, Tuyserkan County, Malayer County & Nahavand County.
Hamadan province is one of the most ancient parts of Iran and its civilization. Relics of this area confirm this fact. Today's Hamedan is what is left of Ecbatana, The Medes' capital before they formed a union with the Persians. The poet Ferdowsi says that Ecbatana was built by King Jamshid.
According to historical records, there was once a castle in this city by the name of Haft Hessar (Seven Walls) which had a thousand rooms and its grandeur equalled that of the Babylon Tower.