Saint Joseph, Illinois

Geography According to the United States Census Bureau, the village has a total area of 3.0 km² (1.1 mi²). 2.9 km² (1.1 mi²) of it is land and 0.0 km² (0.0 mi²) of it is water. The total area is 0.00% water.

Demographics As of the census of 2000, there are 2,912 people, 1,125 households, and 834 families residing in the village. The population density is 995.0/km² (2,572.3/mi²). There are 1,157 housing units at an average density of 395.3 persons/km² (1,022.0 persons/mi²). The racial makeup of the village is 98.90% White, 0.10% African American, 0.07% Native American, 0.24% Asian, 0.00% Pacific Islander, 0.24% from other races, and 0.45% from two or more races. 0.86% of the population are Hispanic or Latino of any race.

There are 1,125 households out of which 40.1% have children under the age of 18 living with them, 65.4% are married couples living together, 6.9% have a woman whose husband does not live with her, and 25.8% are non-families. 22.4% of all households are made up of individuals and 11.3% have someone living alone who is 65 years of age or older. The average household size is 2.58 and the average family size is 3.03.

In the village the population is spread out with 28.5% under the age of 18, 6.3% from 18 to 24, 33.0% from 25 to 44, 21.4% from 45 to 64, and 10.9% who are 65 years of age or older. The median age is 36 years. For every 100 females there are 94.5 males. For every 100 females age 18 and over, there are 92.3 males.

The median income for a household in the village is $53,424, and the median income for a family is $61,094. Males have a median income of $40,250 versus $29,450 for females. The per capita income for the village is $21,381. 4.3% of the population and 2.8% of families are below the poverty line. Out of the total people living in poverty, 4.0% are under the age of 18 and 8.9% are 65 or older.