Middlesex County is located in the Commonwealth of Massachusetts and is the most populous county in the state. The county seat is Cambridge.

Middlesex County is governed by a Board of County Commissioners, which consists of seven members. The county is divided into 25 cities and towns, each of which is represented by a town or city council.

The county is home to several major universities, including Harvard University, MIT, Tufts University, and Brandeis University. It is also home to the Middlesex County Courthouse, the Middlesex County Superior Court, and the Middlesex County District Attorney's Office.

The county is served by the MBTA, which provides public transportation to the cities and towns of Middlesex County. The county is also served by the Massachusetts Bay Transportation Authority (MBTA) commuter rail system, which provides service to Boston and other cities in the region.

The county is home to several major medical centers, including Massachusetts General Hospital, Brigham and Women's Hospital, and Beth Israel Deaconess Medical Center.

For the most up-to-date and in-depth information, please check the public records links below.