
Cornish
- County:
- Sullivan County
- County Seat:
- No
- Area (mi²):
- 41.954
- State:
- New Hampshire
Cornish is located in Sullivan County, New Hampshire. Cornish has a 2025 population of 1,643. Cornish is currently declining at a rate of -0.12% annually but its population has increased by 1.8% since the most recent census, which recorded a population of 1,614 in 2020.
The average household income in Cornish is $104,473 with a poverty rate of 5.4%. The median age in Cornish is 57.4 years: 56.2 years for males, and 58.3 years for females.