Roselle
- County:
- Union County
- County Seat:
- No
- Area (mi²):
- 2.635
- State:
- New Jersey
Roselle is a borough located in Union County, New Jersey. Roselle has a 2026 population of 23,064. Roselle is currently growing at a rate of 1.57% annually and its population has increased by 2.03% since the most recent census, which recorded a population of 22,606 in 2020.