The town was destroyed by the flood of 1881. At that time, the Mississippi River, which serves as the state's western border, cut across the village and took up a new channel through the Kaskaskia River. The people of Kaskaskia, startled to find themselves in Missouri, demanded that the boundary conform to the old channel. Kaskaskia is therefore the only part of Illinois west of the Mississippi.
As of the census of 2000, there are 9 people, 4 households, and 3 families residing in the village. The population density is 31.6/km² (83.0/mi²). There are 5 housing units at an average density of 17.6/km² (46.1/mi²). The racial makeup of the village is 77.78% White, 0.00% African American, 0.00% Native American, 0.00% Asian, 11.11% Pacific Islander, 11.11% from other races, and 0.00% from two or more races. 22.22% of the population are Hispanic or Latino of any race.
There are 4 households out of which 0.0% have children under the age of 18 living with them, 50.0% are married couples living together, 25.0% have a female householder with no husband present, and 25.0% are non-families. 25.0% of all households are made up of individuals and 25.0% have someone living alone who is 65 years of age or older. The average household size is 2.25 and the average family size is 2.67.
In the village the population is spread out with 22.2% under the age of 18, 11.1% from 18 to 24, 11.1% from 25 to 44, 22.2% from 45 to 64, and 33.3% who are 65 years of age or older. The median age is 48 years. For every 100 females there are 28.6 males. For every 100 females age 18 and over, there are 40.0 males.