Derby is a census-designated place (CDP) in Adams County, Colorado, United States. The population was 7,685 at the 2010 census.
Derby is located at 39°50′20″N 104°55′1″W / 39.83889°N 104.91694°W / 39.83889; -104.91694 (39.838785, -104.917082).
According to the United States Census Bureau, the CDP has a total area of 1.6 square miles (4.1 km), all of it land.
As of the census of 2000, there were 6,423 people, 2,061 households, and 1,572 families residing in the CDP. The population density was 3,920.8 people per square mile (1,512.2/km²). There were 2,145 housing units at an average density of 1,309.4 per square mile (505.0/km²). The racial makeup of the CDP was 68.39% White, 1.53% African American, 2.69% Native American, 0.87% Asian, 0.09% Pacific Islander, 21.56% from other races, and 4.86% from two or more races. Hispanic or Latino of any race were 47.27% of the population.
There were 2,061 households out of which 38.7% had children under the age of 18 living with them, 54.2% were married couples living together, 14.0% had a female householder with no husband present, and 23.7% were non-families. 18.3% of all households were made up of individuals and 6.6% had someone living alone who was 65 years of age or older. The average household size was 3.06 and the average family size was 3.45.
In the CDP, the population was spread out with 29.6% under the age of 18, 10.7% from 18 to 24, 29.9% from 25 to 44, 20.2% from 45 to 64, and 9.6% who were 65 years of age or older. The median age was 31 years. For every 100 females, there were 107.4 males. For every 100 females age 18 and over, there were 110.4 males.
The median income for a household in the CDP was $38,571, and the median income for a family was $41,156. Males had a median income of $28,354 versus $24,792 for females. The per capita income for the CDP was $13,844. About 9.7% of families and 10.4% of the population were below the poverty line, including 11.3% of those under age 18 and 15.3% of those age 65 or over.