Alexander is a city in McKenzie County, North Dakota in the United States. The population was 223 at the 2010 census. Alexander was founded in 1905 and is named after early North Dakota politician Alexander McKenzie.
According to the United States Census Bureau, the city has a total area of 1.44 square miles (3.72 km²), of which, 1.43 square miles (3.7 km²) of it is land and 0.01 square miles (0.02 km²) is water.
As of the census of 2010, there were 223 people, 100 households, and 60 families residing in the town. The population density was 156.1 people per square mile (60.3/km²). There were 120 housing units at an average density of 84 per square mile (32.4/km²). The racial makeup of the town was 91.5% White, 1.8% African American, 4.9% Native American, 0.4% from other races, and 1.3% from two or more races. Hispanic or Latino of any race were 4.9% of the population.