This is the Living Arrangements (KS104) from the 2011 Census. The data provides the number of people aged 16+ in households who are:
Living in a couple: Married or in a registered same-sex civil partnership
Living in a couple: Cohabiting
Not living in a couple: Single (never married or never registered a same-sex civil partnership)
Not living in a couple: Married or in a registered same-sex civil partnership
Not living as a couple: Separated (but still legally married or still legally in a same-sex civil partnership)
Not living in a couple: Divorced or formerly in a same-sex civil partnership which is now legally dissolved
Not living in a couple: Widowed or surviving partner from a same-sex civil partnership
The 2011 census in England and Wales took place on 27th March 2011. It provides a snapshot of the population and its characteristics on that day.
Further information about the census estimates, including details about the methodology is available here: http://www.ons.gov.uk/ons/guide-method/census/2011/index.html
Two people are described as cohabiting if they are living together as a couple but are not married to each other or in a registered same-sex civil partnership together. This includes people living with a partner of the same sex. A cohabiting person might be married or in a civil partnership (with someone not resident in the household) but will not be shown as married, in a civil partnership or separated in results relating to living arrangements because cohabiting in this classification takes priority over legal marital or partnership status.
A household is defined as one person living alone, or a group of people (not necessarily related) living at the same address who share cooking facilities and share a living room or sitting room or dining area. A household must contain at least one person whose place of usual residence is at the address. A group of short-term residents living together is not classified as a household, and neither is a group of people at an address where only visitors are staying.
Living in a couple
The term 'living in a couple' includes people who are living together in a couple and are either married, in a same-sex civil partnership, or are cohabiting with a partner of any sex.
The living arrangements classification combines responses to the question on marital and civil partnership status with information about whether or not a person is living in a couple. This topic is only applicable to people living in households. Living arrangements differs from marital and civil partnership status because cohabiting takes priority over other categories. For example, if a person is divorced and cohabiting, then in results for living arrangements they are classified as cohabiting.
Not living in a couple
A person ‘not living in a couple’ can be classified as married or in a same-sex civil partnership if they denote their marital status as married or in a same-sex civil partnership but have no spouse or same-sex partner resident in the household.
The main population base for outputs from the 2011 Census is the usual resident population as at census day 27 March 2011. Although the population base for enumeration included non-UK short-term residents, this population is analysed separately and is not included in the main outputs from the 2011 Census. All outputs, unless specified, are produced using only usual residents of the UK. For 2011 Census purposes, a usual resident of the UK is anyone who, on census day, was in the UK and had stayed or intended to stay in the UK for a period of 12 months or more, or had a permanent UK address and was outside the UK and intended to be outside the UK for less than 12 months.