2020 census As of the
2020 census, Marquette had a population of 20,629 with 8,364 households and 3,651 families residing in the city. The median age was 32.8 years. 12.3% of residents were under the age of 18 and 17.6% of residents were 65 years of age or older. For every 100 females there were 117.2 males, and for every 100 females age 18 and over there were 119.8 males age 18 and over. There were 8,364 households, of which 17.7% had children under the age of 18 living in them. Of all households, 33.1% were married-couple households, 24.7% were households with a male householder and no spouse or partner present, and 33.6% were households with a female householder and no spouse or partner present. About 39.3% of all households were made up of individuals, 13.6% had someone living alone who was 65 years of age or older, and the average household size was 2.17. The average family size was 2.7. of 2010, there were 21,355 people, 8,321 households, and 3,788 families residing in the city. The population density was . There were 8,756 housing units at an average density of . The racial makeup of the city was 91.1% White, 4.4% African American, 1.5% Native American, 0.9% Asian, 0.3% from
other races, and 1.8% from two or more races. Hispanic or Latino of any race were 1.4% of the population. There were 8,321 households, of which 18.6% had children under the age of 18 living with them, 33.3% were married couples living together, 9.0% had a female householder with no husband present, 3.3% had a male householder with no wife present, and 54.5% were non-families. 38.2% of all households were made up of individuals, and 11.8% had someone living alone who was 65 years of age or older. The average household size was 2.05 and the average family size was 2.71. The median age in the city was 29.1 years. 12.2% of residents were under the age of 18; 30.6% were between the ages of 18 and 24; 22.3% were from 25 to 44; 21.9% were from 45 to 64; and 13% were 65 years of age or older. The gender makeup of the city was 51.8% male and 48.2% female.
2000 census At the 2000 census, there were 19,661 people, 8,071 households and 4,067 families residing in the city. The population density was . There were 8,429 housing units at an average density of . The racial makeup of the city was 95% White, 0.8% African American, 1.7% Native American, 0.8% Asian, 0%
Pacific Islander, 0.22% from other races, and 1.33% from two or more races. Hispanic or Latino of any race were 0.77% of the population. 15.5% were of German, 12.6%
Finnish, 8.9% French, 8.5% English, 8.2% Irish, 6.8% Italian and 6.7%
Swedish ancestry according to
Census 2000. There were 8,071 households, of which 23.0% had children under the age of 18 living with them, 37.2% were married couples living together, 10.2% had a female householder with no husband present, and 49.6% were non-families. 37.0% of all households were made up of individuals, and 11.5% had someone living alone who was 65 years of age or older. The average household size was 2.13 and the average family size was 2.81. Age distribution was 16.8% under the age of 18, 25.9% from 18 to 24, 23.8% from 25 to 44, 19.7% from 45 to 64, and 13.8% who were 65 years of age or older. The median age was 31 years. For every 100 females, there were 94.4 males. For every 100 females age 18 and over, there were 92.4 males. The median household income was $29,918, and the median family income was $48,120. Males had a median income of $34,107 versus $24,549 for females. The per capita income for the city was $17,787. About 7.2% of families and 17.0% of the population were below the poverty line, including 12.3% of those under age 18 and 5.1% of those age 65 or over. and Federal Building on
Washington Street ==Business==