The state paid $320,000 in unwarranted travel expenses to eight workers because officials thought they were working out of a more distant office, an audit revealed Tuesday.

The workers were assigned to the Tappan Zee Bridge reconstruction project at a Department of Transportation office in Tarrytown — but, due to a administrative screw-up, they were labeled as being at a Poughkeepsie office, 35 miles further away from their homes.

That meant that from 2007 to 2011, the workers collected $320,756 in car mileage, tolls and other reimbursed expenses until the error was discovered, state Comptroller Thomas Napoli found.