There were 21,901 households, of which 25.9% had children under the age of 18 living with them, 52.1% were married couples living together, 7.3% had a female householder with no husband present, 2.8% had a male householder with no wife present, and 37.8% were non-families. 31.1% of all households were made up of individuals, and 11.9% had someone living alone who was 65 years of age or older. The average household size was 2.25 and the average family size was 2.85.