Middlesex County is a county located in the Commonwealth of Massachusetts, United States. As of the 2020 census, the population was 1,632,002, making it the most populous county in both Massachusetts and See more

According to the U.S. Census Bureau, the county has a total area of 847 square miles (2,190 km ), of which 818 square miles (2,120 km ) is land and 29 square miles (75 km ) (3.5%) is water. It is the third-largest county in Massachusetts by land area. See more

The primary responsibility of the Middlesex Sheriff's Office is oversight of the Middlesex House of Correction and Jail in Billerica. … See more

Middlesex County is home to the Middlesex County Volunteers, a fife and drum corps that plays music from the 17th, 18th, 19th and 20th … See more

The county was created by the Massachusetts General Court on May 10, 1643, when it was ordered that "the whole plantation within … See more

As of 2006 , Middlesex County was tenth in the United States on the list of most millionaires per county.
As of the 2010 United States Census, there were 1,503,085 … See more

School districts include:
K-12:
• Ayer-Shirley School District
• See more