In 2013 there were 18.2 million families in the UK. Of these, 12.3 million consisted of a married couple with or without children The number of opposite sex cohabiting couple families has increased significantly, from 2.2 million in 2003 to 2.9 million in 2013. The number of dependent children living in opposite sex cohabiting couple families rose from 1.4 million to 1.9 million over the same period There were nearly 1.9 million lone parents with dependent children in the UK in 2013, a figure which has grown steadily but not significantly from 1.8 million in 2003 There were 26.4 million households in the UK in 2013. Of these, 29% consisted of only one person and 20% consisted of four or more people The fastest growing household type was households containing two or more families, increasing by 39% from 206,000 households in 2003 to 286,000 households in 2013. However multi-family households still only represent 1% of all households.