2020 census As of the
2020 census, Dexter had a population of 4,500 and a
population density of . The median age was 40.6 years. 26.2% of residents were under the age of 18 and 17.2% were
65 years of age or older. For every 100 females there were 88.1 males, and for every 100 females age 18 and over there were 85.3 males age 18 and over. Dexter's population grew 10.6% from 2010 to 2020. 99.4% of residents lived in urban areas, while 0.6% lived in rural areas. There were 1,796
households in Dexter, of which 37.0% had children under the age of 18 living in them. Of all households, 53.6% were married-couple households, 13.5% were households with a male householder and no spouse or partner present, and 28.3% were households with a female householder and no spouse or partner present. About 28.7% of all households were made up of individuals and 13.4% had someone living alone who was 65 years of age or older.
2010 census As of the 2010 census, there were 4,067 people, 1,590 households, and 1,067 families residing in the city. The population density was . There were 1,704 housing units at an average density of . The racial makeup of the city was 92.7% White, 1.1% African American, 0.4% Native American, 2.8% Asian, 0.8% from other races, and 2.2% from two or more races. Hispanic or Latino people of any race were 2.8% of the population. Dexter's population grew 62.9% from 2000 to 2010, the largest growth in the state during that period. The median age in the city was 36.2 years, and the gender makeup was 47.1% male and 52.9% female. 31% of residents were under the age of 18; 4.8% were between the ages of 18 and 24; 32.6% were from 25 to 44; 23.2% were from 45 to 64; and 8.6% were 65 years of age or older. There were 1,590 households, of which 42.6% had children under the age of 18 living with them, 51.8% were
married couples living together, 12.3% had a female householder with no
husband present, 3.1% had a male householder with no
wife present, and 32.9% were non-families. 28.2% of all households were made up of individuals, and 8.7% had someone living alone who was 65 years of age or older. The average household size was 2.56, and the average family size was 3.20.
2000 census At the 2000 census, there were 2,338 people, 1,013 households, and 641 families residing in the city. The population density was . There were 1,106 housing units at an average density of . The racial makeup of the city was 96.58% White, 0.43% African American, 0.30% Native American, 1.03% Asian, 0.26% from other races, and 1.41% from two or more races. Hispanic or Latino people of any race were 0.98% of the population. The median age in the city was 34 years, and the gender makeup was 48.7% male and 51.3% female. 26.4% of the population were under the age of 18, 6.6% from 18 to 24, 38.1% from 25 to 44, 19.0% from 45 to 64, and 9.8% were 65 years of age or older. There were 1,013 households, of which 34.5% had children under the age of 18 living with them, 46.6% were married couples living together, 13.2% had a female householder with no husband present, and 36.7% were non-families. 32.3% of all households were made up of individuals, and 9.0% had someone living alone who was 65 years of age or older. The average household size was 2.31, and the average family size was 2.92. The median household income was $50,510, and the median family income was $62,697. About 2.8% of families and 4.5% of the population were below the poverty line, including 6.3% of those under age 18 and 3.7% of those age 65 or over. ==Government==