Here is a list of the most underpaid jobs in America.Door-to-Door Salespeople. IM Score: 20. ... Hosts and Hostesses. IM Score: 21. ... Dishwashers. IM Score: 22. ... Postal Service Workers. IM Score: 28. ... Parking Attendants. IM Score: 29. ... Dispatchers. IM Score: 30. ... Parole Officer. IM Score: 31. ... Public Defender. IM Score: 32.