
Black River
- County:
- Jefferson County
- County Seat:
- No
- Area (mi²):
- 1.781
- State:
- New York
Black River is a village located in Jefferson County, New York. Black River has a 2025 population of 1,221. Black River is currently declining at a rate of -0.65% annually and its population has decreased by -3.1% since the most recent census, which recorded a population of 1,260 in 2020.
The average household income in Black River is $92,304 with a poverty rate of 13.72%. The median age in Black River is 38.1 years: 38.4 years for males, and 37.9 years for females.