Elmer is a very small borough located in the state of New Jersey. With a population of 1,358 people and three associated neighborhoods, Elmer is the 460th largest community in New Jersey. Elmer has an unusually large stock of pre-World War II architecture, making it one of the older and more historic boroughs.

Being a small borough, Elmer does not have a public transit system used by locals to get to and from work.

The overall education level of Elmer is somewhat higher than in the average US city of 21.84%: 25.06% of adults 25 and older in the borough have at least a bachelor's degree.

The per capita income in Elmer in 2022 was $40,778, which is lower middle income relative to New Jersey, and upper middle income relative to the rest of the US. This equates to an annual income of $163,112 for a family of four.

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

The most common language spoken in Elmer is English. Other important languages spoken here include Italian and Polish.