Iranian-Armenians , sometimes called Persian- are Iranian citizens who are ethnically Armenian. They are mostly concentrated in Tehran, Tabriz and Jolfa district, Isfahan, and an estimated 800,000 currently reside in Iran. The Iranian-Armenians were very influential and active in the modernization of Iran during the 19th and 20th centuries. After the Iranian Revolution, many Armenians emigrated to Armenian diasporic communities in North America and Western Europe. Today the Armenians are Iran's largest Christian religious minority. Despite their cultural Armenian identity in Iran, no sizable numbers of Iranian-Armenians hold Armenian citizenship. The Armenian language used in Iran holds a unique position in the usage of Armenian in the world. Usually, the traditional Armenian Diaspora worldwide that emanated from the Ottoman Empire and emigrated to the Middle East, Europe and the Americas, uses Western Armenian. However the Armenians of Iran, owing to their proximity to the Armenian Republic, actually speak an Eastern Armenian dialect that is very close to that used in Armenia, Georgia and Russia. Armenians can be found in almost every major city of Iran, engaged in a variety of professions and occupations, as university professors, physicians, high-school teachers, businessmen, engineers, skilled workers, truck drivers, artists, technicians, artisans, professional athletes, etc.