
Ayer
- County:
- Middlesex County
- County Seat:
- No
- Area (mi²):
- 1.326
- State:
- Massachusetts
Ayer is a CDP located in Middlesex County, Massachusetts. Ayer has a 2025 population of 2,994. Ayer is currently growing at a rate of 0.27% annually and its population has increased by 17.37% since the most recent census, which recorded a population of 2,551 in 2020.
The average household income in Ayer is $102,124 with a poverty rate of 8.97%. The median age in Ayer is 48 years: 46.5 years for males, and 49.5 years for females.