South Khorasan Province is one of the 31 provinces of Iran, located in the eastern part of the country. Birjand is the centre and capital of the province. At the time of the National Census of 2006, the province had a population of 600,568 in 159,255 households. The following census in 2011 counted 662,534 people in 183,114 households. In 2014, it was placed in Region 5. At the most recent census in 2016, the population of South Khorasan province had risen to 768,898 in 223,984 households.