More Philly-area classrooms are seeing lower measles vaccination rates. How protected is your school?
In the Philly region in 2025, almost 250 kindergartens had measles vaccination rates below 95%, the level at which experts say is needed to prevent community spread.
After years of declining vaccination rates, Pennsylvania is experiencing one the nation’s largest measles outbreaks in decades.
In the Philly region in 2025, almost 250 schools had kindergarten vaccination levels below 95% — the threshold that epidemiologists say is needed to prevent community spread of the virus.
The Inquirer analyzed the most recent kindergarten vaccination data available for 1,800 schools to pinpoint the communities, neighborhoods, and individual schools where children are most vulnerable.
In Philadelphia, Delaware, Chester, Montgomery, and Bucks Counties, 40% of kindergarten classrooms were vulnerable to an outbreak during the 2025-26 school year, up from 33% the year prior, an Inquirer analysis of state data found.
Kindergarten vaccination rates are considered a bellwether for a community’s attitudes toward vaccination, as parents are deciding whether to get the shots required by law to attend school.
Search the table below to see the measles, mumps, and rubella (MMR) vaccination rate among kindergartners at your school and how it has changed since last year.
The data were obtained from the state health department through a public records request. It did not include schools with fewer than 20 kindergarten students, which the state withheld citing privacy concerns.
