
Denning
- County:
- Ulster County
- County Seat:
- No
- Area (mi²):
- 105.666
- State:
- New York
Denning is located in Ulster County, New York. Denning has a 2025 population of 489. Denning is currently declining at a rate of -0.2% annually and its population has decreased by -0.81% since the most recent census, which recorded a population of 493 in 2020.
The average household income in Denning is $102,110 with a poverty rate of 34.64%. The median age in Denning is 43.3 years: 39.3 years for males, and 46.6 years for females.