Americans are hard workers, putting in an average of 1,805 hours per year, according to the World Economic Forum. It is possible to work hard without overdoing it, though. Hard work is key to success, and the people of some states understand that better than others. Top 20 Hardest-Working StatesNorth Dakota was rated at number one, the hardest working state. Plus, workers ages 16 to 64 in North Dakota work an average of 39.6 hours per week, the fourth-most in the country.