Lamar County is named for Lucius Quintus Cincinnatus Lamar, who was a United States Representative, a Senator from Mississippi and a United States Secretary of the Interior.
Surrounding County Courthouses:
N – Spalding County and Butts County
E – Monroe County
S – Monroe County and Upson County
W – Pike County
Created: November 2, 1920 
County Seat:
Barnesville 1920 – present
County Courthouse – Barnesville
Location: 326 Thomaston Street / Holmes Street
Built: 1930 – 1931
Style: Neo-Classical Revival
Architect: Eugene C Wachendorff
Contractor: Barnesville Planing Mill Company
Description: The building faces northwest and is a two story red colored brick and concrete structure. The building is located on landscaped grounds in the center of Barnesville.The central section projects from the main building and rises above the north and south wings. The northwest front has a large portico with four large Doric columns rising to a pediment at the roof line. The roof line is flat. In the interior the entrance lobby has a crest set in the marble floor. There is wood trim throughout the building. On the second story, the large County Superior Court courtroom is located at the center with windows along the west front. The wood chairs are former theater chairs acquired from an abandoned theater in the city. The building houses the County Superior Court, County Juvenile Court and County Probate Court of the 6th Judicial District. The building was renovated and an addition constructed in 1978. The architect was Bilbro, Spangler & Manley and the contractor was Joe Ellis Construction Company. The building was expanded in 1998. The architect was Cropsey and Associates, Inc. of Griffin and the contractor was Hendricks Construction Company Inc. of Monroe. On the east side of the courthouse is the Old County Jail.
See: The 6th Judicial District includes Butts County, Carroll County, Clayton County, Coweta County, Fayette County, Heard County, Henry County, Meriwether County, Monroe County, Pike County, Spalding County, Troup County and Upson County.
History: The county was created in 1920 and Barnesville was selected as the county seat. The first court met in rented premises in Barnesville from 1920 until 1931 and the Masonic Hall was used for court hearings. The first and present courthouse was constructed in 1930 to 1931.
Old County Jail – Barnesville
Location: 326 Thomaston Street / Holmes Street
Built: 1935 – 1938
Style: Federal
Architect: Unknown
Contractor: Unknown
Description: The building faces northwest and is a two story red colored brick and concrete structure. The building is located on landscaped grounds in the center of Barnesville on the southeast side of the courthouse. Vertical white colored pilasters are at the corners and on either side of the central northwest entrance. The roof line is flat. The building was a Works Project Administration The building was used until 1992 and now houses the Lamar County Museum.
County Courthouse – Barnesville
County Superior Court courtroom
Old County Jail – Barnesville
Photos taken 2013, 2023 and 2024