Bath is a village in Mason County, Illinois, United States. The population was 310 at the 2000 census.
According to the 2010 census, Bath has a total area of 0.36 square miles (0.93 km2), all land.
As of the census of 2000, there were 310 people, 130 households, and 86 families residing in the village. The population density was 848.9 people per square mile (323.5/km2). There were 153 housing units at an average density of 419.0 per square mile (159.7/km2). The racial makeup of the village was 96.45% White, 0.32% African American, 0.97% Native American, and 2.26% from two or more races. Hispanic or Latino of any race were 0.32% of the population.
There were 130 households, out of which 28.5% had children under the age of 18 living with them, 46.2% were married couples living together, 16.2% had a female householder with no husband present, and 33.8% were non-families. 32.3% of all households were made up of individuals, and 10.8% had someone living alone who was 65 years of age or older. The average household size was 2.38 and the average family size was 2.95.