Hecker is a village in Monroe County in the U.S state of Illinois. The population was 481 at the 2010 census.
According to the 2010 census, the village has a total area of 0.24 square miles (0.62 km), all land.
As of the census of 2000, there were 475 people, 188 households, and 134 families residing in the village. The population density was 1,993.8 people per square mile (764.2/km²). There were 201 housing units at an average density of 843.7 per square mile (323.4/km²). The racial makeup of the village was 99.16% White, 0.21% African American, and 0.63% from two or more races. Hispanic or Latino of any race were 0.63% of the population.
There were 188 households out of which 31.9% had children under the age of 18 living with them, 60.1% were married couples living together, 9.6% had a female householder with no husband present, and 28.2% were non-families. 23.4% of all households were made up of individuals and 10.1% had someone living alone who was 65 years of age or older. The average household size was 2.53 and the average family size was 3.02.
In the village, the population was spread out with 22.3% under the age of 18, 9.7% from 18 to 24, 31.2% from 25 to 44, 23.6% from 45 to 64, and 13.3% who were 65 years of age or older. The median age was 36 years. For every 100 females there were 106.5 males. For every 100 females age 18 and over, there were 100.5 males.
The median income for a household in the village was $43,333, and the median income for a family was $51,071. Males had a median income of $38,125 versus $21,447 for females. The per capita income for the village was $18,423. About 2.8% of families and 4.7% of the population were below the poverty line, including 10.1% of those under age 18 and none of those age 65 or over.