Census ACS 2023 · 14 counties
Largest Counties in Massachusetts
Massachusetts has 14 counties with Census data available. The largest is Middlesex County with a population of 1,622,896. County-level data is important because counties are the primary unit of local government in most states, responsible for courts, elections, public health, and infrastructure. Population distribution across counties reveals where growth is concentrated and where rural decline may be occurring.
Source: Census ACS 2023 5-Year Estimates
| # | County | Population | Median Income |
|---|---|---|---|
| 1 | Worcester County | 861,664 | $93,561 |
| 2 | Suffolk County | 782,172 | $92,859 |
| 3 | Plymouth County | 531,889 | $109,698 |
| 4 | Norfolk County | 724,540 | $126,497 |
| 5 | Nantucket County | 14,299 | $119,750 |
| 6 | Middlesex County | 1,622,896 | $126,779 |
| 7 | Hampshire County | 156,595 | $86,391 |
| 8 | Hampden County | 462,853 | $70,535 |
| 9 | Franklin County | 70,922 | $72,584 |
| 10 | Essex County | 807,258 | $99,431 |
| 11 | Dukes County | 20,751 | $102,348 |
| 12 | Bristol County | 578,436 | $84,198 |
| 13 | Berkshire County | 128,047 | $72,565 |
| 14 | Barnstable County | 230,073 | $94,452 |
More Rankings for Massachusetts
Frequently Asked Questions
Middlesex County is the #1 ranked county in Massachusetts by population, with a value of 1,622,896 according to Census ACS 2023 data.
Massachusetts has 14 counties tracked in Census ACS 2023 data.
All data comes from the American Community Survey (ACS) 2023 5-Year estimates by the US Census Bureau.
Data from the American Community Survey 2023 5-Year estimates. Covers all counties in Massachusetts.