Hazen is a city in Mercer County, North Dakota, United States. The population was 2,411 at the 2010 census. Hazen was founded in 1913. Hazen has a K-12 school system.
It is located about fifteen minutes south of Lake Sakakawea, the largest lake in North Dakota and the third largest man-made lake in the United States.
A post office has been in operation at Hazen since 1885. A. D. Hazen, an early postmaster, gave the settlement its name. Hazen was laid out in 1913, when the railroad was extended to that point.
Hazen is located at 47°17′49″N 101°37′25″W (47.297083, -101.623616).
According to the United States Census Bureau, the city has a total area of 1.27 square miles (3.29 km2), all land.
As of the census of 2010, there were 2,411 people, 1,020 households, and 742 families living in the city. The population density was 1,898.4 inhabitants per square mile (733.0/km2). There were 1,074 housing units at an average density of 845.7 per square mile (326.5/km2).