With five days left for people to return their census forms, Wisconsin is leading the nation with a 77 percent participation rate. And starting Tuesday about 40 census workers called enumerators were squeezing more completed forms from one of Madisonâ??s lowest-participation areas – UW-Madison student housing. “Our enumerators and crew members will be swarming the campus,” said Patrick Ryan, who manages the Census Bureauâ??s 10-county Madison region. Most residents received census forms in the mail, but in UW-Madison dormitories, the forms were placed in dorm mailboxes Monday, said John Lucas, a university spokesman.