Middlesex County is named for the County of Middlesex in England.
Surrounding County Courthouses:
N – Hillsborough County, New Hampshire
E – Essex County, Suffolk County and Norfolk County
S – Norfolk County
W – Worcester County
Created: May 10, 1643 
County Seat:
Cambridge 1643 – present
County Courthouse – Cambridge
Location: 53 Thorndike Street / Third Street
Built: 1812 – 1813
Style: Greek Revival
Architect: Charles Bulfinch
Contractor: Unknown
Description: The building faces east and is a two story red colored brick style structure. Addition in 1848. The architect was Ammi B Young. Addition in 1898. The architect was Wait & Cutler. Further addition in 1924.
County Probate Courthouse – Cambridge
Location: 208 Cambridge Street / Third Street
Built: 1894 – 1896
Style: Greek Revival / Neo-Classical
Architect: Olin B Cutter
Contractor: Unknown
Description: The building faces north and he building is a three story dark red colored brick and concrete structure. The north front has a large central portico with four columns rising to a wide pediment. The center section of the building is recess with a projecting east and west section. The building was the Registry of Deeds and now serves as the Probate and Family Courthouse.
County Juvenile Courthouse – Cambridge
Location: 121 Third Street / Spring Street
Built: 1931 – 1933
Style: Modern Greek Revival
Architect: Charles Greco
Contractor: Unknown
Description: The building faces east and is a two story red colored brick and concrete structure. The building is located on landscaped grounds, across from the old courthouse. The east front has a large portico with entrance on the first story and four columns on the second story with pediment above. On the roof is an octagonal open cupola. The roof line is flat. The building houses the Juvenile Court.
Other Branch Courthouses
Ayer / Concord / Framingham / Lowell / Malden / Marlborough / Medford / Newton / Somerville / Waltham / Woburn
Old County Courthouse - Cambridge
Photos taken 2017