Nepal has been conducting population censuses since 1911. The first four censuses were conducted under the Rana Regime and were limited to specific purposes. In 1952/54, the first attempt was made to collect internationally comparable data from the census. Computers were used first in 1971. The census of 1991, the first after the restoration of democracy, collected information on caste and ethnicity. The census of 2001 introduced sampling in the census for the first time. The National Population Census of 2011 is the eleventh census and marks 100 years in the history of census taking in the country.
The total population of Nepal, as of 22 June 2011, was 26.5 million with a decadal increase of 14.4% from 2001. The population a decade age, or in 2001, was 23.2 million. The average annual growth rate of the population from 2001 to 2011 was 1.35%, a sharp decline from the 2.25% of the previous decade 1991-2001. The number of households stands at 5.4 million in 2011.