Total Population in Middlesex County, MA
ACS 2024 5-Year Estimates
How Middlesex County Compares
National Distribution
Where Middlesex County falls among all 3,222 U.S. counties for total population.
■ Middlesex County: 1,638,365
Ranking Context
| Rank | County | Value |
|---|---|---|
| #18 | Santa Clara County, CA | 1,902,047 |
| #19 | Wayne County, MI | 1,772,259 |
| #20 | Alameda County, CA | 1,649,473 |
| #21 | Middlesex County, MA | 1,638,365 |
| #22 | New York County, NY | 1,629,477 |
| #23 | Sacramento County, CA | 1,594,006 |
| #24 | Philadelphia County, PA | 1,579,706 |
Total Population in Middlesex County, Massachusetts
Middlesex County, Massachusetts has a total population of 1,638,365, which ranks #21 of 3,222 out of 3,222 counties nationwide. This is 99.5% below the national value of 330M.
Within Massachusetts, Middlesex County ranks #1 of 14 out of 14 counties. This places it in the 99th percentile nationally.
Total population count from the American Community Survey. All data comes from the U.S. Census Bureau's American Community Survey (ACS) 5-Year Estimates for 2024.
About this data
Source: U.S. Census Bureau, American Community Survey 5-Year Estimates (2024). All values are estimates derived from survey samples and are subject to margin of error. For more information, see our methodology.