Joy is a village in Mercer County, Illinois. The population was 417 in the 2010 census.
Joy is located at 41°11′49″N 90°52′47″W / 41.19694°N 90.87972°W / 41.19694; -90.87972 (41.196923, -90.879702).
According to the 2010 census, Joy has a total area of 0.43 square miles (1.11 km), all land.
At the 2000 census, there were 373 people, 156 households and 104 families residing in the village. The population density was 888.3 per square mile (342.9/km²). There were 167 housing units at an average density of 397.7 per square mile (153.5/km²). The racial makeup of the village was 99.46% White, and 0.54% from two or more races. Hispanic or Latino of any race were 1.07% of the population.
There were 156 households of which 32.1% had children under the age of 18 living with them, 54.5% were married couples living together, 9.6% had a female householder with no husband present, and 33.3% were non-families. 29.5% of all households were made up of individuals and 13.5% had someone living alone who was 65 years of age or older. The average household size was 2.39 and the average family size was 2.96.
26.5% of the population were under the age of 18, 9.7% from 18 to 24, 27.3% from 25 to 44, 20.9% from 45 to 64, and 15.5% who were 65 years of age or older. The median age was 35 years. For every 100 females, there were 92.3 males. For every 100 females age 18 and over, there were 91.6 males.
The median household income was $36,625 and the median family income was $39,722. Males had a median income of $32,232 versus $25,500 for females. The per capita income was $14,201. About 12.7% of families and 18.6% of the population were below the poverty line, including 26.9% of those under age 18 and 4.3% of those age 65 or over.