Jordanians are Arabs, except for a few small communities of Circassians, Armenians, and Kurds which have adapted to Arab culture. The official language is Arabic, but English is used widely in commerce and government. About 70% of Jordan's population is urban; less than 6% of the rural population is nomadic or seminomadic. Most people live where the rainfall supports agriculture. About 1.5 million Palestinian Arabs--including more than 950,000 registered refugees and displaced persons--reside in Jordan, many as citizens.