Health department administrator Joni Wise tells the Tribune-Star that some Indiana State University students attended a Jan. 24 party with the Rose-Hulman student.
Officials at both schools say they've sent out notifications about the illness.
Wise says most people mumps immunization, but the shots don't prevent all cases and there has been a resurgence of cases in the Midwest.
Mumps is spread by coughing and sneezing. Common symptoms are fever, headache and swollen glands.