A post office called Mizpah has been in operation since 1901. Mizpah is a name derived from Hebrew meaning "watchtower". The Minnesota state record for latest measurable snowfall was recorded in Mizpah on June 4, 1935 when the town received an inch and a half of snowfall.
As of the census of 2010, there were 56 people, 28 households, and 15 families residing in the city. The population density was. There were 45 housing units at an average density of. The racial makeup of the city was 98.2% White and 1.8% Asian. There were 28 households of which 32.1% had children under the age of 18 living with them, 28.6% were married couplesliving together, 17.9% had a female householder with no husband present, 7.1% had a male householder with no wife present, and 46.4% were non-families. 35.7% of all households were made up of individuals and 17.8% had someone living alone who was 65 years of age or older. The average household size was 2.00 and the average family size was 2.47. The median age in the city was 39.5 years. 23.2% of residents were under the age of 18; 7.2% were between the ages of 18 and 24; 23.3% were from 25 to 44; 23.2% were from 45 to 64; and 23.2% were 65 years of age or older. The gender makeup of the city was 53.6% male and 46.4% female.
2000 census
As of the census of 2000, there were 78 people, 31 households, and 19 families residing in the city. The population density was 25.7 people per square mile. There were 51 housing units at an average density of 16.8 per square mile. The racial makeup of the city was 85.90% White and 14.10% Native American. Hispanic or Latino of any race were 1.28% of the population. There were 31 households out of which 29.0% had children under the age of 18 living with them, 54.8% were married couples living together, 9.7% had a female householder with no husband present, and 35.5% were non-families. 29.0% of all households were made up of individuals and 19.4% had someone living alone who was 65 years of age or older. The average household size was 2.52 and the average family size was 3.25. In the city, the population was spread out with 28.2% under the age of 18, 5.1% from 18 to 24, 25.6% from 25 to 44, 23.1% from 45 to 64, and 17.9% who were 65 years of age or older. The median age was 38 years. For every 100 females, there were 122.9 males. For every 100 females age 18 and over, there were 115.4 males. The median income for a household in the city was $34,375, and the median income for a family was $53,125. Males had a median income of $28,750 versus $25,000 for females. The per capita income for the city was $18,519. 19.0% of families and 25.7% of the population were living below the poverty line, including 69.2% of those under the age of 18 and none of those ages 65 or older.
