Percentage of children ages 3 to 4 not enrolled in school.
US Census Bureau, American Community Survey.
Percentage of 3 and 4-year-olds enrolled in school, 2011-15. U.S. Census Bureau, “S1401: School Enrollment.” 2015 American Community Survey 5-Year Estimates. American FactFinder.
Data for each year is a five-year average. Interpret data with caution for small counties, as estimates can be imprecise.