As of the 2020 census, Proctor had a population of 3,120. The median age was 41.4 years. 22.1% of residents were under the age of 18 and 20.1% of residents were 65 years of age or older. For every 100 females there were 102.3 males, and for every 100 females age 18 and over there were 97.4 males age 18 and over.^[7][8]

98.1% of residents lived in urban areas, while 1.9% lived in rural areas.^[9]

There were 1,313 households in Proctor, of which 27.0% had children under the age of 18 living in them. Of all households, 47.1% were married-couple households, 19.6% were households with a male householder and no spouse or partner present, and 24.9% were households with a female householder and no spouse or partner present. About 32.8% of all households were made up of individuals and 12.8% had someone living alone who was 65 years of age or older.^[7]

There were 1,373 housing units, of which 4.4% were vacant. The homeowner vacancy rate was 0.7% and the rental vacancy rate was 2.5%.^[7]

As of the census^[10] of 2010, there were 3,057 people, 1,268 households, and 795 families living in the city. The population density was 1,019.0 inhabitants per square mile (393.4/km²). There were 1,361 housing units at an average density of 453.7 per square mile (175.2/km²). The racial makeup of the city was 96.8% White, 0.2% African American, 1.1% Native American, 0.4% Asian, 0.2% from other races, and 1.3% from two or more races. Hispanic or Latino of any race were 1.2% of the population.

There were 1,268 households, of which 27.4% had children under the age of 18 living with them, 48.8% were married couples living together, 9.6% had a female householder with no husband present, 4.3% had a male householder with no wife present, and 37.3% were non-families. 30.4% of all households were made up of individuals, and 13% had someone living alone who was 65 years of age or older. The average household size was 2.34 and the average family size was 2.90.

The median age in the city was 41.4 years. 20.7% of residents were under the age of 18; 8.2% were between the ages of 18 and 24; 25.5% were from 25 to 44; 29.7% were from 45 to 64; and 16.1% were 65 years of age or older. The gender makeup of the city was 49.3% male and 50.7% female.

As of the census of 2000,^[3] there were 2,852 people, 1,196 households, and 772 families living in the city. The population density was 942.8 inhabitants per square mile (364.0/km²). There were 1,246 housing units at an average density of 411.9 per square mile (159.0/km²). The racial makeup of the city was 96.49% White, 0.14% African American, 1.16% Native American, 0.53% Asian, 0.28% from other races, and 1.40% from two or more races. Hispanic or Latino of any race were 0.74% of the population. 19.8% were of German, 17.9% Norwegian, 10.3% Swedish, 7.3% French, 7.0% Finnish, 6.2% Polish, 6.0% Irish and 5.4% Italian ancestry.

There were 1,196 households, out of which 28.6% had children under the age of 18 living with them, 51.5% were married couples living together, 10.6% had a female householder with no husband present, and 35.4% were non-families. 30.8% of all households were made up of individuals, and 17.1% had someone living alone who was 65 years of age or older. The average household size was 2.38 and the average family size was 2.99.

In the city, the population was spread out, with 24.0% under the age of 18, 9.4% from 18 to 24, 27.3% from 25 to 44, 23.6% from 45 to 64, and 15.8% who were 65 years of age or older. The median age was 38 years. For every 100 females, there were 86.6 males. For every 100 females age 18 and over, there were 85.8 males.

The median income for a household in the city was $38,322, and the median income for a family was $49,875. Males had a median income of $33,583 versus $22,035 for females. The per capita income for the city was $18,851. About 3.2% of families and 5.0% of the population were below the poverty line, including 5.5% of those under age 18 and 5.9% of those age 65 or over.

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