New Castle is a somewhat small city located in the state of Delaware. With a population of 5,533 people and 16 associated neighborhoods, New Castle is the 14th largest community in Delaware. Much of the housing stock in New Castle was built prior to World War II, making it one of the older and more historic cities in the country.

Also of interest is that New Castle has more people living here who work in computers and math than 95% of the places in the US.

Telecommuters are a relatively large percentage of the workforce: 14.80% 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 overall education level of New Castle citizens is substantially higher than the typical US community, as 32.02% of adults in New Castle have at least a bachelor's degree, and the average American community has 21.84%.

The per capita income in New Castle in 2022 was $53,997, which is wealthy relative to Delaware and the nation. This equates to an annual income of $215,988 for a family of four.

New Castle is an extremely ethnically-diverse city. 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 English, Irish, German, Polish, and Italian.

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