Andover
- County:
- Sussex County
- County Seat:
- No
- Area (mi²):
- 1.348
- State:
- New Jersey
Andover is a borough located in Sussex County, New Jersey. Andover has a 2026 population of 610. Andover is currently growing at a rate of 0.66% annually and its population has increased by 2.69% since the most recent census, which recorded a population of 594 in 2020.