Unfilled jobs are piling up in the transportation, retail and business-services sectors as workers become scarce in the fast-growing economy.
The number of available jobs grew by nearly 750,000 this spring, compared with a year earlier, according to Labor Department data released Tuesday. There were 6.7 million job openings on average in the three months ended in June—the highest quarterly level on record dating back to 2001. Economists often look at three-month averages for openings because the data can be choppy month to...