The city was named for the place of origin of many of the early settlers, Danbury, Essex in England. The city has been nicknamed Hat City, because it used to be a center of the hat industry, at one point producing 25% of America's hats. Danbury is home to Danbury Hospital and Danbury High School.

Geography - According to the United States Census Bureau, the city has a total area of 44.3 square miles, of which, 42.1 square miles of it is land and 2.2 square miles of it (4.94%) is water. Danbury surrounds the southern parts of Candlewood Lake.

As of the census of 2000, there were 74,848 people, 27,183 households, and 17,886 families residing in the city. The population density was 1,777.4 people per square mile. There were 28,519 housing units at an average density of 677.2/sq mi. The racial makeup of the city was 76.0% White, 6.8% African American, 0.29% Native American, 5.5% Asian, 0.03% Pacific Islander, 7.6% from other races, and 4.0% from two or more races. Hispanic or Latino of any race were 15.8% of the population.

There were 27,183 households out of which 30.3% had children under the age of 18 living with them, 51.1% were married couples living together, 10.5% had a female householder with no husband present, and 34.2% were non-families. 26.2% of all households were made up of individuals and 8.5% had someone living alone who was 65 years of age or older. The average household size was 2.64 and the average family size was 3.18.

The population was distributed as follows: 21.7% under the age of 18, 10.2% from 18 to 24, 35.4% from 25 to 44, 21.7% from 45 to 64, and 11.0% 65 years of age or older. The median age was 35 years. For every 100 females there were 96.2 males. For every 100 females age 18 and over, there were 94.3 males.

The median income for a household in the city was $53,664, and the median income for a family was $61,899. Males had a median income of $39,016 versus $31,319 for females. The per capita income for the city was $24,500. About 5.9% of families and 8.0% of the population were below the poverty line, including 8.7% of those under age 18 and 8.3% of those age 65 or over.