According to the estimates, the population of the province in 2015 is about 702,360 people and in fact 0.88% of the total population of the country, of which 560,502 are urban and 141,858 are rural and the relative density of the population This year, there are 7.2 people per square kilometer

In Semnan province, prominent cultural, religious and mystical figures and personalities were born and raised. Great scholars such as Bayezid Bastami, the great sage, Sheikh Abul Hasan Kharqani, Sheikh Alaa al-Doulah Semnani, Foroghi Bastami, Manouchehri Damghani, Ibn Yamin Faryoumdi, Yaghmai Jandaghi, Haj Mullah ‌Ali Hakim Elahi Semnani, Ayat A... Shahroudi, Allameh Haeri Semnani and many others. The poets and great men of science and literature who have a special reputation in Iran all originated from this land and lived in this system and shine in the world of mysticism and science.