In every state except Mississippi and West Virginia, parents can legally choose not to vaccinate their children against common illnesses before enrolling them in school.
Nationwide, 1.8 percent of parents choose to opt out of vaccinations for these diseases — such as pertussis (whooping cough) and measles — for nonmedical reasons.
Here’s a look at where they can do it:
According to the Centers for Disease Control and Prevention, local clusters of nonvaccinated children can be more vulnerable to disease outbreaks. At 7 percent, Oregon had the hightest number of unvaccinated kindergarteners for the 2013-2014 school year. Virginia and the District of Columbia had the lowest, both at 0.4 percent.
CORRECTION: The note for the second map erroneously read that data was not available for Colorado. Data is not available for Ill., Minn., Miss., Mo., W. Va., and Wyo.