National population and housing census 2011 (NPHC2011), marks a hundred years of census taking in Nepal. Nepal has been conducting population censuses almost decennially and the census 2011 is the eleventh. The first population census was conducted in 1911 A.D. (1968 B.S.). However, the census conducted in 1952/54 is considered to be the first modern census of Nepal introducing internationally comparable concepts, definitions and classifications. Computer processing was introduced for the first time in 1971 census using IBM 1401. NPHC 2011 carries special features of having scientific questionnaires, detailed EA maps for urban and Village Development Committees (VDC) maps for rural areas, ever most inclusive field staff, extensive publicity, independent observance by civil society, most economic operation based on domestic resources and most reliable data processing.