Measles cases by state in 2026: 10 states in the CDC's data, led by Pennsylvania
Measles cases by state in 2026: a look at 10 states in CDC data as of Nov. 5, from Pennsylvania's 1,476 cases to Florida's 149. Pennsylvania has the highest 2026 measles count in the CDC's state-by-state data, with 1,476 cases reported as of Nov. 5, 2026. That is 806 more than South Carolina, the next state on the list. Pennsylvania's count is also more than double South Carolina's 670.