The CDC recently posted information about the number of confirmed cases of measles in the first three months of 2015, as well as in which states those cases occurred.
From the post:
From January 1 to March 13, 2015, 176 people from 17 states and the District of Columbia were reported to have measles [AZ (7), CA (118), CO (1), DC (2), DE (1), GA (1), IL (15), MI (1), MN (1), NE (2), NJ (2), NY (3), NV (9), PA (1), SD (2) TX (1), UT (2), WA (7)].
Most of these cases [130 cases (74%)] are part of a large, ongoing multi-state outbreak linked to an amusement park in California.