A city's economy is a reflection of its population, and New Salem is no exception. The city's median age is 45.4, and its household income is $63,702 - a 21.5% increase in a decade. In terms of ethnic makeup, the city is comprised of 5 different groups, with no significant ethnic minority group. Similarly, the number of households speaking any language other than English is zero, with no non-Hispanic residents.
Founded in 1737, the town first received its official incorporation in 1753. Named for its Salem settlers, it was greatly benefited by the building of the Quabbin Reservoir. Previously, the city only extended north of Cooleyville, but later, all the lands above the water line were given to the city. It was the only connection to the peninsula.
The population of New Salem is diverse. Although it is majority White, it includes residents from several other racial groups, including African Americans. Additionally, residents report Italian, Irish, German, English, and Polish ancestry. Most people in the city speak English as their primary language, though they also speak Polish and Spanish. These groups are actively involved in the community and continue to serve as a valuable source of information for those interested in the city's history.
The city's economy benefited from a food processing plant operated by the H.J. Heinz Company from 1905 to 1977. With the opening of the Delaware Memorial Bridge, commuting to Philadelphia and other South Jersey counties became more convenient. The decline in the number of former manufactories created a pressing need for additional industry in the area. Tourism, manufacturing, and glassmaking industries began to flourish.