Hammond is a village in Piatt County, Illinois, United States. The population was 509 at the 2010 census.
Hammond was named for Charles Goodrich Hammond, a railroad official.
Hammond is located at 39°47′50″N 88°35′34″W (39.797133, -88.592777).
According to the 2010 census, Hammond has a total area of 0.761 square miles (1.97 km2), of which 0.76 square miles (1.97 km2) (or 99.87%) is land and 0.001 square miles (0.00 km2) (or 0.13%) is water.
As of the census of 2000, there were 518 people, 225 households, and 141 families residing in the village. The population density was 679.8 people per square mile (263.2/km2). There were 244 housing units at an average density of 320.2 per square mile (124.0/km2). The racial makeup of the village was 98.26% White, 0.58% African American, 0.19% Native American, 0.19% Asian, 0.58% from other races, and 0.19% from two or more races. Hispanic or Latino of any race were 0.19% of the population.
There were 225 households, out of which 24.9% had children under the age of 18 living with them, 55.6% were married couples living together, 5.3% had a female householder with no husband present, and 36.9% were non-families. 32.4% of all households were made up of individuals, and 15.1% had someone living alone who was 65 years of age or older. The average household size was 2.30 and the average family size was 2.95.