Demographics & People — Marlborough, New Hampshire
Population Overview
| Population (Census) | 925 |
| Estimated 2026 | ~1,400 |
| Median Age | 47.6 |
| Total Households | 464 |
| Family Households | 238 |
| Average Household Size | 1.99 |
| Diversity Index | N/A (N/A) |
Race & Ethnicity
| White | 901 |
| Black or African American | 0 |
| Asian | 0 |
| Hispanic or Latino | 0 |
Heritage & Ancestry
| Group | Count |
| English | 324 |
| Irish | 178 |
| Unclassified or not reported | 144 |
| French (except Basque) | 108 |
| Italian | 90 |
| German | 89 |
| Scottish | 76 |
| Other groups | 71 |
| French Canadian | 40 |
| American | 38 |
Language
| English Only | 874 |
| Spanish | 12 |
| Population 5+ | 886 |
Veterans
| Veterans | 54 |
| Population 18+ | 844 |
Source: Census ACS 5-Year 2023; Census ACS 5-Year 2023, Table B01003; Census ACS 5-Year 2023, B19013. Data for Marlborough, New Hampshire.