Killingly is a medium-sized town located in the state of Connecticut. With a population of 17,945 people and four associated neighborhoods, Killingly is the 66th largest community in Connecticut.

One interesting thing about the economy is that relatively large numbers of people worked from their home: 9.44% of the workforce. While this number may seem small overall, as a fraction of the total workforce this is high compared to the rest of the county. These workers are often telecommuters who work in knowledge-based, white-collar professions. For example, Silicon Valley has large numbers of people who telecommute. Other at-home workers may be self-employed people who operate small businesses out of their homes.

The population of Killingly overall has a level of education that is slightly above the US average for all US cities and towns of 21.84%. Of adults 25 and older in Killingly, 24.13% have at least a bachelor's degree.

The per capita income in Killingly in 2022 was $38,775, which is low income relative to Connecticut, and upper middle income relative to the rest of the US. This equates to an annual income of $155,100 for a family of four. However, Killingly contains both very wealthy and poor people as well.

Killingly is a somewhat ethnically-diverse town. The people who call Killingly home describe themselves as belonging to a variety of racial and ethnic groups. The greatest number of Killingly residents report their race to be White, followed by Black or African-American. Important ancestries of people in Killingly include French, English, Irish, Italian, and German.

The most common language spoken in Killingly is English. Other important languages spoken here include Spanish and Portuguese.