New Castle is a medium-sized city located in the state of Indiana. With a population of 17,329 people and eight associated neighborhoods, New Castle is the 51st largest community in Indiana.

Telecommuters are a relatively large percentage of the workforce: 7.36% of people work from home. While this number may seem small overall, as a fraction of the total workforce it is high relative to the nation. 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 citizens of New Castle are slightly less educated than the national average of 21.84% for the average city or town: 13.89% of adults in New Castle have a bachelor's degree or advanced degree

The per capita income in New Castle in 2022 was $28,016, which is lower middle income relative to Indiana and the nation. This equates to an annual income of $112,064 for a family of four. However, New Castle contains both very wealthy and poor people as well.

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

The most common language spoken in New Castle is English. Other important languages spoken here include Spanish and Italian.