Lamar County Georgia (Historic Districts) has 3 places on the National Register of Historic Places including 2 places of Statewide significance. Significant places include Barnesville Commercial Historic District and Johnstonville--Goggins Historic District, Barnesville Commercial Historic District, Thomaston Street Historic District.
Some of the country's most noteable architects helped create the Lamar County places including James A. Wetmore, Eugene C. Wachendorff and Whitfield & King. Prominent architectural styles found in Lamar Country are Late 19th And 20th Century Revivals, Late Victorian and Art Deco.