Lassen County is named for Peter Lassen, who was a Danish naturalist and explorer.
Surrounding County Courthouses:
N – Modoc County
E – Washoe County, Nevada
S – Sierra County and Plumas County
W – Plumas County and Shasta County
Created: April 1, 1864 
County Seat:
Susanville 1864 – present
County Courthouse – Susanville
Location: 220 South Lassen Street / Mill Street
Built: 1916 – 1917
Style: Classical Revival
Architect: George C Sellon of Sacramento
Contractor: James L McLaughlin
Description: The building faces southeast and is a two story brown colored sandstone and concrete structure. The building is located on landscaped grounds in the center of Susanville. The southeast front has a high central section which extends from the main building and has a porch with four columns rising to a terra-cotta ornamentation on the header. A projecting cornice runs below the flat roof line. The building is rectangular with a concrete foundation, The building now houses the county administration. On the west side is the old County Jail built in 1911. The buildings including a Courthouse Annex constructed in the 1960′s and a concrete jail constructed in 1970 are located on the spacious grounds of Courthouse Square.
See: George C Sellon of Sacramento designed courthouses in Amador County, Nevada County, Plumas County, Sierra County and Tehama County.
See: National Register of Historic Places – Courthouse Square
County Hall of Justice – Susanville
Location: 2610 Riverside Drive / Grove Street
Built: 2009 – 2012
Style: Modern
Architect: Lionakis Architects of Sacramento
Contractor: Clark & Sullivan
Description: The building faces northeast and is a two story concrete and glass structure. The building is located on spacious landscaped grounds in the center of Susanville to the east of the courthouse. The north east front has a large projecting center section with five vertical dividers with glass panels between The roof line is flat. The building is the Hall of Justice.
History: The first courthouse was a two story frame structure built in 1867. The second and present courthouse was constructed in 1916 to 1917. The Hall of Justice was constructed in 2009 to 2012.
County Courthouse – Susanville
Old County Jail – Susanville
County Hall of Justice – Susanville
Photos taken 2013 and 2015