| Place Name | Ayer |
| Place Type | Census Designated Place |
| ZIP Code(s) | 01432 |
| County | Middlesex County |
| Area Code(s) | 351,978 |
| Timezone | Eastern Standard Time (EST) |
| Population (2022) | 2,693 |
| Population Growth Rate (2010-19) | 4.11% |
| Majority Ethnicity | White 71.33% |
| Metro/Micro Stats Area | Boston-Cambridge-Newton, MA-NH |
| US Congressional District(s) | Massachusetts 3rd |
| State House Districts | 1st Middlesex |
| State Senate Districts | Middlesex and Worcester |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 71.33% |
| African American | 6.5% |
| Hispanic | 0.39% |
| Asian | 3.06% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 18.73% |