South Bound Brook
- County:
- Somerset County
- County Seat:
- No
- Area (mi²):
- 0.645
- State:
- New Jersey
South Bound Brook is a borough located in Somerset County, New Jersey. South Bound Brook has a 2026 population of 4,965. South Bound Brook is currently growing at a rate of 2.22% annually and its population has increased by 2.31% since the most recent census, which recorded a population of 4,853 in 2020.