
Brentwood
- County:
- Rockingham County
- County Seat:
- No
- Area (mi²):
- 16.817
- State:
- New Hampshire
Brentwood is located in Rockingham County, New Hampshire. Brentwood has a 2025 population of 4,864. Brentwood is currently growing at a rate of 1.91% annually and its population has increased by 8.11% since the most recent census, which recorded a population of 4,499 in 2020.
The average household income in Brentwood is $193,932 with a poverty rate of 2.75%. The median age in Brentwood is 44.3 years: 43.8 years for males, and 45.2 years for females.