Plymouth County is named for the town of Plymouth which is the county seat and which was named for the English port city of Plymouth.
Surrounding County Courthouses:
N – Norfolk County and Suffolk County
E – Atlantic Ocean
W – Bristol County and Norfolk County
Created: June 2, 1685 
County Seat:
Plymouth 1685 – present
County Courthouse – Plymouth
Location: 52 Obery Street / South Street
Built: 2005 – 2007
Style: Modern
Architect: Perry Dean Rogers Architects
Contractor: Gilbane Building Company
Description: The building faces northwest and is a four story red colored brick, glass and steel structure. The building is located on spacious landscaped grounds on the south side of the city. The southeast side is rectangular with vertical windows and dark red colored brick vertical dividers. On the northwest is a rectangular wing with large glass panels, overhanging sloped roof and buff colored brick. The roof line is flat. The building is named as the Plymouth Trial Court.
Note: The cost of construction was $71,000,000.
Old County Courthouse – Plymouth
Location: 11 Russell Street / Court Street
Built: 1820 – 1821
Style: Colonial Revival
Architect: John Blaney Bates of Plymouth
Contractor: John Blaney Bates of Plymouth
Description: The building faces northeast and is a two story red colored brick and wood structure. The building is located on the southwest side of a small park in the center of the city. The northeast front has two one story porticoes with balconies on the second story. The second story windows are arched. The center section rises to a peak above the roof line. The roof is hipped. On the center of the roof is an open white colored cupola. The building was remodeled in 1857. The facade was enlarged both north and south by one bay. The architect and the contractor was Edmund Robbins of Plymouth and Jason Perkins and James Ford. In 2017, the building was converted to a residence.
Old County Courthouse – Plymouth
Location: 1 Town Square / Leyden Street
Built: 1749 – 1750
Style: Colonial
Architect: Judge Peter Oliver.
Contractor: Judge Peter Oliver.
Description: The building faces north and is a two story wood frame structure. The building is located on the Town Square in the center of the city and is five bays wide and three deep, with a center entry flanked by sidelight windows and pilasters, and topped by a gabled pediment. The building served as a courthouse and as town offices and was converted to solely municipal use in 1821. The building is named as the Plymouth Old County Court House and Museum.
Note: The first courthouse was built in 1620. The 1749 courthouse is the oldest courthouse in the United States.
Other Branch Courthouses
County Courthouse
Old County Courthouse
Old Courthouse
Photos taken 2017