Derby is a city located in New Haven County Connecticut. With a 2020 population of 12,213, it is the 20th largest city in Connecticut and the 2682nd largest city in the United States . Derby is currently declining at a rate of -0.51% annually and its population has decreased by -5.34% since the most recent census, which recorded a population of 12,902 in 2010. Derby reached it's highest population of 12,878 in 2010. Spanning over 5 miles, Derby has a population density of 2,416 people per square mile.
The average household income in Derby is $72,778 with a poverty rate of 12.99%. The median rental costs in recent years comes to $1,087 per month, and the median house value is $206,300. The median age in Derby is 40 years, 38.2 years for males, and 41.2 years for females.