Middlesex County is a county in the Commonwealth of Massachusetts, in the United States. As of 2016, the estimated population was 1,589,774, making it the twenty-first most populous county in the United States, and the most populous county in both Massachusetts and New England.
Middlesex County was one of the four original counties when Massachusetts Bay Colony created counties in 1643. When established, it had no defined western or northern border. These borders were more clearly defined when Worcester County was created in 1731 on the west and the Province of New Hampshire in 1680 to the north, but this border remained in dispute until 1741.
- Source: Wikipedia
Map of the area
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