Hammond is a city in Lake County, Indiana, United States. It is part of the Chicago metropolitan area. The population was 80,830 at the 2010 census, replacing Gary as the most populous city in Lake County.Demographics2010 censusAs of the census of 2010, there were 80,830 people, 29,949 households, and 19,222 families residing in the city. The population density was 3548.3PD/sqmi. There were 32,945 housing units at an average density of 1446.2/sqmi. The racial makeup of the city was 59.4% White, 22.5% African American, 0.5% Native American, 1.0% Asian, 13.3% from other races, and 3.3% from two or more races. Hispanic or Latino of any race were 34.1% of the population.There were 29,949 households of which 36.2% had children under the age of 18 living with them, 37.0% were married couples living together, 19.7% had a female householder with no husband present, 7.5% had a male householder with no wife present, and 35.8% were non-families. 30.3% of all households were made up of individuals and 9.7% had someone living alone who was 65 years of age or older. The average household size was 2.67 and the average family size was 3.36.