Alexander is a city in McKenzie County, North Dakota, United States. The population was 319 at the 2020 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 (3.73 km), of which 1.43 square miles (3.70 km) is land and 0.01 square miles (0.03 km) is water.

According to the Köppen climate classification system, Alexander has a semi-arid to humid continental climate, abbreviated "BSk" to "DFb" on climate maps.

Historical population

Census	Pop.	Note	%±
1930	386		—
1940	415		7.5%
1950	302		−27.2%
1960	269		−10.9%
1970	208		−22.7%
1980	358		72.1%
1990	216		−39.7%
2000	217		0.5%
2010	223		2.8%
2020	319		43.0%
2022 (est.)	299		−6.3%
U.S. Decennial Census 2020 Census

As of the census of 2010, there were 223 people, 100 households, and 60 families residing in the city. The population density was 155.9 inhabitants per square mile (60.2/km). There were 120 housing units at an average density of 83.9 per square mile (32.4/km). The racial makeup of the city 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.

There were 100 households, of which 21.0% had children under the age of 18 living with them, 48.0% were married couples living together, 5.0% had a female householder with no husband present, 7.0% had a male householder with no wife present, and 40.0% were non-families. 32.0% of all households were made up of individuals, and 15% had someone living alone who was 65 years of age or older. The average household size was 2.23 and the average family size was 2.82.

The median age in the city was 43.3 years. 18.4% of residents were under the age of 18; 9% were between the ages of 18 and 24; 25.1% were from 25 to 44; 32.3% were from 45 to 64; and 15.2% were 65 years of age or older. The gender makeup of the city was 55.6% male and 44.4% female.

As of the census of 2000, there were 217 people, 87 households, and 60 families residing in the city. The population density was 150.6 inhabitants per square mile (58.1/km). There were 106 housing units at an average density of 73.6 per square mile (28.4/km). The racial makeup of the city was 93.55% White, 5.99% Native American, 0.46% from other races. Hispanic or Latino of any race were 1.38% of the population.

The top 6 ancestry groups in the city are Norwegian (49.3%), German (32.7%), Irish (18.0%), English (8.3%), Swedish (7.4%), Dutch (4.1%).

There were 87 households, out of which 32.2% had children under the age of 18 living with them, 59.8% were married couples living together, 4.6% had a female householder with no husband present, and 31.0% were non-families. 28.7% of all households were made up of individuals, and 10.3% had someone living alone who was 65 years of age or older. The average household size was 2.49 and the average family size was 3.08.

The median income for a household in the city was $26,042, and the median income for a family was $35,625. Males had a median income of $25,000 versus $20,000 for females. The per capita income for the city was $11,630. About 15.9% of families and 20.3% of the population were below the poverty line, including 24.7% of those under the age of eighteen and 21.1% of those 65 or over.

• Arthur A. Link (May 24, 1914 - June 1, 2010), 27th Governor of North Dakota