In countries around the world, increasing numbers of parents are having children without getting married. OECD research has shown that in the United States, 2.9 per cent of children lived with unmarried parents in 2005, a rate that increased slightly to 4.2 per cent in 2014. Out of all countries included in the research, Estonia has the highest rate of children living with cohabiting parents, just under 31 per cent, up from 18 per cent in 2005. One of the most interesting trends is the rise of cohabiting parents in countries where religion and family life were or still are strongly intertwined.
Poland stands out in particular with its rate of children living with unmarried parents rising sharply from just 2.5 per cent over a decade ago to 15 per cent today. Ireland is another notable example, experiencing an increase of nearly seven percentage points during the same time frame. Some countries also saw a decline in the percentage of children living with unmarried parents. In 2005, 11.8 per cent of Danish kids lived in households where their parents were not married and this fell to 9.7 per cent by 2014. Greece also saw a fall from 0.8 to 0.6 per cent between 2005 and 2014.