Dixmoor is adjacent to Harvey, Illinois, and keeps Harvey's east-west numbering system, even though most of the village lies west of Ashland Avenue/Wood Street.
As of the 2000 census, there were 3,934 people, 1,372 households, and 887 families residing in the village. The population density was 3,164.6 people per square mile (1,224.9/km²). There were 1,471 housing units at an average density of 1,183.3/sq mi (458.0/km²). The racial makeup of the village was 57.12% African American, 30.81% White, 0.25% Native American, 0.15% Asian, 9.48% from other races, and 2.19% from two or more races. Hispanic or Latino of any race were 18.20% of the population, including 16.2% of Mexican descent. The top three non-African, non-Hispanic ancentries reported in Dixmoor as of the 2000 census were German (6.6%), Irish (6.0%) and Polish (4.8%).
There were 1,372 households out of which 30.3% had children under the age of 18 living with them, 34.2% were married couples living together, 22.1% had a female householder with no husband present, and 35.3% were non-families. 29.7% of all households were made up of individuals and 12.2% had someone living alone who was 65 years of age or older. The average household size was 2.83 and the average family size was 3.56.
In the village the population was spread out with 30.4% under the age of 18, 9.9% from 18 to 24, 29.0% from 25 to 44, 18.3% from 45 to 64, and 12.5% who were 65 years of age or older. The median age was 32 years. For every 100 females there were 92.2 males. For every 100 females age 18 and over, there were 88.8 males.
The median income for a household in the village was $26,677, and the median income for a family was $30,423. Males had a median income of $29,777 versus $30,714 for females. The per capita income for the village was $11,712. About 21.1% of families and 30.3% of the population were below the poverty line, including 46.6% of those under age 18 and 10.7% of those age 65 or over.