The United Nations Statistics Division collects, compiles and disseminates official demographic and social statistics on a wide range of topics. Data have been collected since 1948 through a set of questionnaires dispatched annually to over 230 national statistical offices and have been published in the Demographic Yearbook collection. The Demographic Yearbook disseminates statistics on population size and composition, births, deaths, marriage and divorce, as well as respective rates, on an annual basis. The Demographic Yearbook census datasets cover a wide range of additional topics including economic activity, educational attainment, household characteristics, housing characteristics, ethnicity, language, foreign-born and foreign population.

Footnotes:
1: During the 2010 Census, the relationship between the members of the household was determined on the basis of a set of questions completed for all members of the household, differently from the 2000 Census. In the 2000 Census, the reference person was used to establish the relationship between the members of the household. In 2010 however, enumerators were instructed to choose a reference person as a mere helpful tool in finding the person who could be most helpful in completing the housing form, given that the owner of the living quarter or the one responsible for paying the rent is often the one who knows the most of the living quarter. Relationship to head of household was not asked in the 2010 Census.
2: 422240 households categorised as "Visitor only" or "Not classifiable " are excluded from this table as a "Household reference person" is not identified in "Visitor only " and "Not classifiable" households.
3: This data has been randomly rounded to protect confidentiality. Individual figures may not add up to totals, and values for the same data may vary in different tables.
4: 1 034 818 persons in households categorised as "Visitor only" or "Not classifiable " are excluded from this table as a "Household reference person" is not identified in "Visitor only " and "Not classifiable" households.
5: Excludes households for which there is no data.
6: Includes one or more family nuclei.
7: The unknown category includes not stated values and/or persons/households for which there is no data.
8: The types of households, which are related to the concepts of families, were derived for the housing units in non-indigenous census tracts.
9: In the Brazilian Census 2010, the families (or family nuclei) were not identified by the interviewer, but through a derived methodology.
10: Source: Brazilian Demographic Census 2010, Sample Survey. The sampling rate depends on the number of persons in the county, according to the estimates of population. The total sampling rate is approximately 11% of the total households.
11: Including polygamous families.
12: Because of rounding, totals are not in all cases the sum of the respective components.
13: Based on a 20 per cent sample of census returns.
14: For statistical purposes, the data for China do not include those for the Hong Kong Special Administrative Region (Hong Kong SAR), Macao Special Administrative Region (Macao SAR) and Taiwan province of China.
15: Data are estimates from sample enquiry.
16: "Nuclear household" refers to "One unextended nuclear family".
17: "Non-nuclear household" refers to "Related persons forming no nuclear family" and "Unrelated persons only".
18: "Unknown" refers to "One vertically extended nuclear family", "One horizontally extended nuclear family" and "Two or more nuclear families".
19: Includes two or more family nuclei.
20: Data refer to private households only.
21: Excludes persons living in collective households that do not present a head of household.
22: Refers to households with a head of household only.
23: Data refer to government controlled areas.
24: Data include multi person households, households with more than one family and couple with resident children.
25: Data refer to households comprised of couples with children less than 26 years of age and not economically active.
26: Data refer to conventional dwellings only.
27: Figures for male and female do not add up to the total, because they exclude unknown age and sex.
28: The household reference person is the first person listed on the household's member list, either a member of a couple or another household member age 15 or over (when no couple is present), and is not necessarily the head of household.
29: Based on a 17 per cent sample of census returns.
30: Includes data for East Jerusalem and Israeli residents in certain other territories under occupation by Israeli military forces since June 1967.
31: Age classification based on year of birth rather than on completed years of age.
32: Refer to households in which it was not possible to identify the 'head' of household.
33: Includes persons not related to head of household and children already married.
34: Data refer to multi-person households.
35: Households are defined as persons inside private housing units.
36: Includes only households with a head of household age 12 years or older.
37: Data refer to enumerated households which do not include households in certain disputed areas.
38: Data include households of single parents with children age 18 or older.
39: Data refers to households of single parents with children under the age of 18.
40: Data refer to semi-nuclear and extended household.
41: Excludes data for Kosovo and Metohia.
42: Data contain both households with children under age 28, economically inactive and households with children aged 28 and over, economically active, living with lone parents.
43: Data in the 'Not Stated' category refer to multi-persons non-family households.
44: Excludes collective living quarters.
45: Including two or more family nuclei and other persons.
46: Excluding data from the parts of Jerusalem which were annexed by Israel in 1967.
47: Data computed by the UN Statistics Division based on the percentage distribution of population by age and sex, as reported in the census report.
48: Data include couples in consensual unions.
49: Data from the March Current Population Survey.
50: Presence of children of any age who have never been married.
51: Couple refers to married opposite sex couple.
52: Represents total households excluding one person households and nuclear households.