Pekin High School in Pekin, Illinois, used to call its athletic teams the "Chinks." I was incredulous, of course, but looked it up in Wikipedia, that final arbiter of all things. Here's what they had to say:
Pekin Community High School District 303 includes Pekin and some nearby areas. The district's high school is Pekin Community High School.
The school teams were known as the Pekin Chinks from the 1930s until 1980 when the school administration changed the nickname to the Dragons. The team mascots were a male and female student dressed as Chinese persons wearing traditional Chinese attire. An earlier attempt was made by a visit of Chinese American groups to change the name from Chinks during the 1974–1975 school year; this was voted down by the student body. The event received national attention.