Despite having a) lots of crude oil; and, b) very low state gasoline taxes.
Reuters is reporting.
North Dakota's residents have received an enormous income windfall from the shale boom, but strong local demand for trucking and fracking fuel has left them facing the highest gasoline prices in the mainland United States.
Only insular Hawaiians pay more to fill up at the pump.
The average price for a gallon of regular gasoline in the remote prairie state is $4.13, compared with $4.00 in California and $3.73 in New York, according to price comparison website GasBuddy.com.
Prices are exceptionally high even though the state levies below average taxes and fees. North Dakota adds just 23 cents per gallon in excise tax and other charges to the pump price of gasoline, compared with an average of 25-27 cents nationwide.
California and New York both add more than 50 cents per gallon, according to the American Petroleum Institute.
The pre-tax cost of gasoline in North Dakota is an eye-watering $3.72 per gallon, 40 cents more than California and almost 70 cents higher than in New York.
Before federal and state taxes, North Dakota gasoline costs nine cents more than in neighbouring South Dakota, 19 cents more than in Minnesota to the immediate east and almost 50 cents more than in Montana to the west.