Mason County is named for C H Mason, who was the first Secretary of the Washington Territory.
Surrounding County Courthouses:
N – Jefferson County and Kitsap County
E – Pierce County
S – Thurston County and Grays Harbor County
W – Grays Harbor County and Jefferson County
Created: March 13, 1854 
County Seat:
Oakland ( Mt. Olive ) 1854 – 1888
Shelton 1888 – present
County Courthouse – Shelton
Location: 411 North 4th Street / West Pine Street
Built: 1929 – 1930
Style: Colonial Revival
Architect: Joseph Henry Wohleb of Olympia
Contractor: Foster & Williams
Description: The building faces east and is a two story dark gray stone and concrete structure. The rectangular shaped building is located on landscaped grounds and has a small protruding entrance with iron balcony above. On the second story are arched windows in the center section. The roof line is flat. The building houses the County Superior Court and the County District Court. Alterations were made in 2013. The architect was Foster and Williams.
See: The architect Joseph Henry Wohleb also designed the old courthouse in Thurston County.
County Courthouse Annex – Shelton
Location: 411 North 5th Street / West Pine Street
Built: 1984 – 1986
Style: Colonial Revival
Architect: Unknown
Contractor: Unknown
Description: The building faces east and is a two story glass and concrete structure. The rectangular shaped building is located on landscaped grounds in the center of Shelton on the west side of the courthouse. The east front has five vertical pillars rising to the overhanging roof line with recessed entrance and large windows. The roof line is flat.
County Courthouse - Shelton
County Courthouse Annex – Shelton
Photos taken 2006 and 2016