Washington
- County:
- Warren County
- County Seat:
- No
- Area (mi²):
- 1.965
- State:
- New Jersey
Washington is a borough located in Warren County, New Jersey. Washington has a 2026 population of 7,375. Washington is currently growing at a rate of 0.27% annually and its population has increased by 1.19% since the most recent census, which recorded a population of 7,288 in 2020.