Posen is a village in Cook County, Illinois, United States. Posen is the German-language name for the western Polish city of Poznań. The population of the village was 5,987 at the 2010 census, up from 4,730 in 2000.
Posen is located at 41°37′42″N 87°41′9″W / 41.62833°N 87.68583°W / 41.62833; -87.68583 (41.628234, -87.685723).
According to the 2010 census, Posen has a total area of 1.17 square miles (3.03 km), all land.
As of the 2010 census, there were 5,987 people, 1,765 households, and 1,383 families residing in the village. The population density was 5,117.1 people per square mile (1,995.7/km²). There were 1,883 housing units at an average density of 1,609.4 per square mile (627.7/km²). The racial makeup of the population was 57.0% white (28.1% non-Hispanic white), 17.3% black, 0.6% Native American, 0.4% Asian, 0.1% Pacific Islander, 20.9% reporting some other race and 3.7% reporting two or more races. 53.0% of the population was Hispanic or Latino of any race, including the 50.5% of the population that identified as being ethnically Mexican.
Estimates of ancestries for the period 2007-2011 put the Polish percentage in Posen at around 7.9% of the population.
There were 1,765 households, out of which 50.0% had children under the age of 18 living with them, 52.2% were headed by married couples living together, 17.1% had a female householder with no husband present, and 21.6% were non-families. 16.8% of all households were made up of individuals, and 5.9% were someone living alone who was 65 years of age or older. The average household size was 3.39, and the average family size was 3.81.
In the village, the population was spread out with 31.5% under the age of 18, 10.3% from 18 to 24, 29.7% from 25 to 44, 21.2% from 45 to 64, and 7.2% who were 65 years of age or older. The median age was 30.8 years. For every 100 females, there were 102.2 males. For every 100 females age 18 and over, there were 99.1 males.
For the period 2007-11, the estimated median annual income for a household in the village was $52,724, and the median income for a family was $53,311. Male full-time workers had a median income of $37,278 versus $30,380 for females. The per capita income for the village was $15,944. About 14.7% of families and 14.0% of the population were below the poverty line, including 17.3% of those under age 18 and 15.3% of those age 65 or over.