Some 54 percent of 3- and 4-year-olds in the United States were enrolled in school, compared to the average enrollment of 80 percent for the Organization for Economic Cooperation and Development (OECD) countries. The OECD is an organization of 35 countries whose purpose is to promote trade and economic growth. Among the 33 OECD countries reporting data in 2015, the percentages of 3- and 4-year-olds enrolled in school ranged from 25 percent or less in Turkey, Switzerland, and Canada to 95 percent or more in Germany, Spain, Norway, Iceland, Denmark, Belgium, France, Israel, and the United Kingdom.
The Condition of Education, 2018. Preschool and Kindergarten Enrollment. Retrieved from The National Center for Education Statistics.