As of the census of 2010, there were 996 people, 439 households, and 263 families living in the city. The population density was. There were 515 housing units at an average density of. The racial makeup of the city was 88.3% White, 0.1% African American, 8.7% Native American, 0.2% from other races, and 2.7% from two or more races. Hispanic or Latino of any race were 1.7% of the population. There were 439 households of which 26.9% had children under the age of 18 living with them, 48.1% were married couples living together, 5.9% had a female householder with no husband present, 5.9% had a male householder with no wife present, and 40.1% were non-families. 36.4% of all households were made up of individuals and 16.8% had someone living alone who was 65 years of age or older. The average household size was 2.21 and the average family size was 2.88. The median age in the city was 45.5 years. 23.8% of residents were under the age of 18; 5.3% were between the ages of 18 and 24; 20.2% were from 25 to 44; 29.7% were from 45 to 64; and 20.7% were 65 years of age or older. The gender makeup of the city was 51.4% male and 48.6% female.
2000 census
As of the census of 2000, there were 1,057 people, 452 households, and 271 families living in the city. The population density was 1,004.4 people per square mile. There were 556 housing units at an average density of 528.3 per square mile. The racial makeup of the city was 89.78% White, 5.96% Native American, 0.09% from other races, and 4.16% from two or more races. Hispanic or Latino of any race were 0.85% of the population. There were 452 households out of which 25.7% had children under the age of 18 living with them, 49.8% were married couples living together, 5.8% had a female householder with no husband present, and 40.0% were non-families. 36.1% of all households were made up of individuals and 21.9% 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 2.90. In the city, the population was spread out with 22.4% under the age of 18, 7.2% from 18 to 24, 21.9% from 25 to 44, 24.9% from 45 to 64, and 23.7% who were 65 years of age or older. The median age was 44 years. For every 100 females, there were 91.8 males. For every 100 females age 18 and over, there were 88.5 males. The median income for a household in the city was $31,875, and the median income for a family was $39,375. Males had a median income of $28,095 versus $20,000 for females. The per capita income for the city was $16,894. About 9.7% of families and 12.5% of the population were below the poverty line, including 11.5% of those under age 18 and 14.2% of those age 65 or over.
Media
From 1896 to 2020, Walhalla was served by The Walhalla Mountaineer, a weekly newspaper. The nearby communities of Langdon and Cavalier continue to have weekly newspapers. In broadcast media, Walhalla is part of the Grand Forks media market.
