Elmer
- County:
- Salem County
- County Seat:
- No
- Area (mi²):
- 0.889
- State:
- New Jersey
Elmer is a borough located in Salem County, New Jersey. Elmer has a 2026 population of 1,377. Elmer is currently growing at a rate of 0.66% annually and its population has increased by 2.53% since the most recent census, which recorded a population of 1,343 in 2020.