
Washington township
- County:
- Warren County
- County Seat:
- No
- Area (mi²):
- 44.584
- State:
- New Jersey
Washington township is located in Warren County, New Jersey. Washington township has a 2025 population of 18,328. Washington township is currently growing at a rate of 0.32% annually and its population has increased by 0.99% since the most recent census, which recorded a population of 18,148 in 2020.
The average household income in Washington township is $207,132 with a poverty rate of 3.55%. The median age in Washington township is 45.9 years: 45.6 years for males, and 46.4 years for females.