| County: | Lamar County |
| State: | Georgia |
| Seat Wl: | Barnesville |
| Largest City Wl: | Barnesville |
| Area Total Sq Mi: | 186 |
| Area Land Sq Mi: | 184 |
| Area Water Sq Mi: | 2.3 |
| Area Percentage: | 1.3% |
| Census Yr: | 2020 |
| Pop: | 18500 |
| Density Sq Mi: | 101 |
| Time Zone: | Eastern |
| Ex Image: | Lamar County Georgia Courthouse.jpg |
| Ex Image Cap: | Lamar County courthouse in Barnesville |
| District: | 3rd |
| Named For: | Lucius Quintus Cincinnatus Lamar II |
Lamar County is a county located in the west central portion of the U.S. state of Georgia. As of the 2020 census, the population was 18,500.[1] The county seat is Barnesville.[2]
The Georgia General Assembly proposed the constitutional amendment to create the county on August 17, 1920, and the citizens of the state voted in favor of the amendment on November 2, 1920.[3] Land from Pike County and Monroe County was then transferred to create Lamar County.Lamar County was named after Confederate Democrat Lucius Quintus Cincinnatus Lamar II.[4]
According to the U.S. Census Bureau, the county has a total area of, of which is land and (1.3%) is water.[5] It is located in the Piedmont region of the state.
The western third of Lamar County, west of a line from Orchard Hill through Milner and Barnesville, is located in the Upper Flint River sub-basin of the ACF River Basin (Apalachicola-Chattahoochee-Flint River Basin). The eastern majority of the county is located in the Upper Ocmulgee River sub-basin of the Altamaha River basin.[6]
| White alone (NH) | 10,683 | 11,943 | 12,344 | 67.14% | 65.20% | 66.72% | |
| Black or African American alone (NH) | 4,806 | 5,621 | 4,888 | 30.20% | 30.69% | 26.42% | |
| Native American or Alaska Native alone (NH) | 42 | 34 | 13 | 0.26% | 0.19% | 0.07% | |
| Asian alone (NH) | 59 | 68 | 102 | 0.37% | 0.37% | 0.55% | |
| Pacific Islander alone (NH) | 1 | 2 | 4 | 0.01% | 0.01% | 0.02% | |
| Other race alone (NH) | 14 | 22 | 48 | 0.09% | 0.12% | 0.26% | |
| Mixed race or Multiracial (NH) | 135 | 286 | 626 | 0.85% | 1.56% | 3.38% | |
| Hispanic or Latino (any race) | 172 | 341 | 475 | 1.08% | 1.86% | 2.57% | |
| Total | 15,912 | 18,317 | 18,500 | 100.00% | 100.00% | 100.00% |
As of the 2020 United States census, there were 18,500 people, 6,494 households, and 3,746 families residing in the county.