From the CDC:
From January 1 to April 26, 2019, 704** individual cases of measles have been confirmed in 22 states. This is an increase of 78 cases from the previous week. This is the greatest number of cases reported in the U.S. since 1994 and since measles was declared eliminated in 2000.
The states that have reported cases to CDC are Arizona, California, Colorado, Connecticut, Florida, Georgia, Illinois, Indiana, Iowa, Kentucky, Maryland, Massachusetts, Michigan, Missouri, Nevada, New Hampshire, New Jersey, New York, Oregon, Texas, Tennessee, and Washington.
*Cases as of December 29, 2018. Case count is preliminary and subject to change.
**Cases as of April 26, 2019. Case count is preliminary and subject to change.