2020 census As of the
2020 census, 23,287 people, 8,005 households, and 5,938 families resided in Gardner. The population density was 1,996.8 per square mile (771.0/km). There were 8,294 housing units at an average density of 711.2 per square mile (274.6/km); 3.5% of housing units were vacant, the homeowner vacancy rate was 1.3%, and the rental vacancy rate was 5.1%. 98.9% of residents lived in urban areas, while 1.1% lived in rural areas. Of the 8,005 households, 47.7% had children under the age of 18 living in them. Of all households, 56.1% were married-couple households, 15.2% were households with a male householder and no spouse or partner present, and 21.6% were households with a female householder and no spouse or partner present. About 20.5% of all households were made up of individuals, and 6.9% had someone living alone who was 65 years of age or older. The average household size was 3.0 and the average family size was 3.3. The 2016-2020 5-year
American Community Survey estimates show that the median household income was $78,193 (with a margin of error of +/- $4,899) and the median family income was $86,859 (+/- $4,392). Males had a median income of $49,402 (+/- $4,503) versus $30,995 (+/- $3,086) for females. The median income for those above 16 years old was $39,662 (+/- $2,267). Approximately, 4.3% of families and 6.0% of the population were below the
poverty line, including 9.6% of those under the age of 18 and 6.9% of those ages 65 or over.
2010 census As of the
census of 2010, there were 19,123 people, 6,644 households, and 4,938 families living in the city. The
population density was . There were 7,300 housing units at an average density of . The racial makeup of the city was 89.7%
White, 3.0%
African American, 0.5%
Native American, 1.9%
Asian, 1.8% from
other races, and 3.0% from
two or more races.
Hispanic or
Latino of any race were 6.2% of the population. There were 6,644 households, of which 49.7% had children under the age of 18 living with them, 58.9% were
married couples living together, 10.3% had a female householder with no husband present, 5.1% had a male householder with no wife present, and 25.7% were non-families. 20.1% of all households were made up of individuals, and 5% had someone living alone who was 65 years of age or older. The average household size was 2.85 and the average family size was 3.31. The median age in the city was 30 years. 33.2% of residents were under the age of 18; 6.6% were between the ages of 18 and 24; 37.7% were from 25 to 44; 17.1% were from 45 to 64; and 5.3% were 65 years of age or older. The gender makeup of the city was 49.9% male and 50.1% female. ==Economy==