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County in Massachusetts Middlesex County Middlesex South Registry of Deeds in Cambridge Seal Massachusetts’s location within the U.S.Coordinates: 42 ° 27 ′ 33 ″ N 71 ° 16 ′ 32 ″ W/ 42.459084 ° N 71.275566 ° W/ 42.459084; -71.275566 Nation United States State Massachusetts Established Might 10, 1643Seat Lowell and Cambridge Largest city Lowell Area • Overall 847 sq mi (2,190 km 2) • Land 818 sq mi (2,120 km 2) • Water 29 sq mi (80 km 2) 3.5%%Population • Price Quote (2018 )1,614,714 • Density 1,838/ sq mi (710/km 2)Time zone UTC − 5 (Eastern) • Summer (DST)UTC − 4 (EDT)Congressional districts 3rd, fourth, 5th, sixth, 7th Middlesex County is a county in the Commonwealth of Massachusetts, in the United States.
As part of the 2010 nationwide census, the Commonwealth’s mean center of population  for that year was geo-centered in Middlesex County, in the town of Natick at (42 ° 16 ′ 20 ″ N 71 ° 21 ′ 48 ″ W/ 42.272291 ° N 71.363370 ° W/ 42.272291; -71.363370).  (This is not to be confused with the geographic center of Massachusetts, which remains in Rutland, in surrounding Worcester County.) Middlesex County is consisted of in the Census Bureau’s Boston– Cambridge– Newton, MA– NH Metropolitan Statistical Location.
Though Middlesex County continues to exist as a geographical border  it is used primarily as district jurisdictions within the court system and for other administrative purposes, such as an indicator for elections. The National Weather condition Service weather condition notifies (such as serious thunderstorm caution) continue issuances based upon Massachusetts’s counties. The county was developed by the Massachusetts General Court on May 10, 1643, when it was bought that “the whole plantation within this jurisdiction be divided into four shires.” Middlesex at first included Charlestown, Cambridge, Watertown, Sudbury, Concord, Woburn, Medford, Wayland, and Reading.  In 1649 the very first Middlesex County Pc registry of Deeds was developed in Cambridge.
In 1855, the Massachusetts State Legislature created a minor Pc registry of Deeds for the Northern District of Middlesex County in Lowell.  In the late 19th century and early 20th century, Boston annexed numerous of its nearby cities and towns consisting of Charlestown and Brighton from Middlesex County, resulting in an enlargement and accretion towards Suffolk County.  Starting prior to dissolution of the executive county federal government, the county comprised two regions with separate county seats for administrative functions: Since the start of the 21st century much of the present and former county offices have actually physically decentralized from the Cambridge seat, with the sole exceptions being the Windows registry of Deeds and the Middlesex Probate and Family Court, which both retain places in Cambridge and Lowell.
There was a County Treasurer chose to a six-year term. The county obtained its earnings primarily from file filing fees at the Registries of Deeds and from a Deeds Excise Tax; also a transfer tax was evaluated on the list price of genuine estate and collected by the Registries of Deeds.  Budgets as proposed by the County Commissioners were approved by a County Board of advisers that consisted of a single representative of each of the 54 cities and towns in Middlesex County.
The County Constable and two Registers of Deeds (one for the Northern District at Lowell and another for the Southern District at Cambridge) are each elected to serve six-year terms.  Besides the workers of the Sheriff’s Workplace and the 2 Pc registries of Deeds, the county had a Maintenance Department, a Security Department, some administrative staff in the Treasurer’s and Commissioners’ Offices, and the staff members of the healthcare facility.
The legislation abolishing the Middlesex County executive retained the Constable and Registers of Deeds as independently chosen officials, and transferred the Constable’s Office under the state Department of Public Security and the 2 Computer registry of Deeds offices to the Massachusetts Secretary of State’s Office.  Furthermore, all county upkeep and security workers were soaked up into the corresponding personnels of the Massachusetts Trial Court.