Classification of census according to time internal.
According to time internal census can be classified as either quinquennial (census carried out after every five years) or decennial census (census carried out after every ten years).
Classification of census accrding to approach.
According to approach census can be either de jure census or de facto census.
- De jure census this is one in which the people are counted according to their usual place of residence, where only permanent members of household are counted.
- De facto census – this is approach to undertaking census in which people are counted wherever they are found on the day of census exercise, that is all people who stayed in the homeland for the night are counted.