More than 35 percent of Americans have debts and unpaid bills that have been reported to collection agencies, according to a study released Tuesday by the Urban Institute.

These consumers fall behind on credit cards or hospital bills. Their mortgages, auto loans or student debt pile up, unpaid. Even past-due gym membership fees or cellphone contracts can end up with a collection agency, potentially hurting credit scores and job prospects, said Caroline Ratcliffe, a senior fellow at the Washington-based think tank.

"Roughly, every third person you pass on the street is going to have debt in collections," Ratcliffe said. "It can tip employers' hiring decisions, or whether or not you get that apartment."