| County Number | SC Counties | Cases of chlamydia among 18 - 24 year olds from 1990-99 divided by population | County / State Ratio |
|---|---|---|---|
| 1 | Pickens County | 3.9 | 0.29 |
| 2 | Greenville County | 5.7 | 0.44 |
| 3 | Berkeley County | 6.0 | 0.46 |
| 4 | Edgefield County | 6.6 | 0.50 |
| 5 | Lexington County | 7.7 | 0.59 |
| 6 | Aiken County | 7.7 | 0.59 |
| 7 | Beaufort County | 8.5 | 0.65 |
| 8 | Dorchester County | 8.9 | 0.68 |
| 9 | Oconee County | 9.2 | 0.70 |
| 10 | Saluda County | 9.4 | 0.72 |
| 11 | Abbeville County | 9.7 | 0.74 |
| 12 | York County | 10.2 | 0.78 |
| 13 | Hampton County | 11.3 | 0.86 |
| 14 | Clarendon County | 11.9 | 0.91 |
| 15 | Cherokee County | 12.0 | 0.92 |
| 16 | Horry County | 12.2 | 0.93 |
| 17 | Calhoun County | 12.3 | 0.94 |
| 18 | Newberry County | 12.9 | 0.98 |
| 19 | Charleston County | 13.1 | 1.00 |
| 20 | Spartanburg County | 13.2 | 1.01 |
| 21 | Florence County | 13.5 | 1.03 |
| 22 | Greenwood County | 14.0 | 1.07 |
| 23 | Kershaw County | 14.1 | 1.08 |
| 24 | Union County | 14.5 | 1.11 |
| 25 | Lancaster County | 15.1 | 1.15 |
| 26 | Colleton County | 15.1 | 1.16 |
| 27 | Richland County | 15.2 | 1.16 |
| 28 | Marion County | 15.4 | 1.18 |
| 29 | Anderson County | 15.6 | 1.19 |
| 30 | Jasper County | 15.8 | 1.21 |
| 31 | McCormick County | 15.8 | 1.21 |
| 32 | Chester County | 16.4 | 1.25 |
| 33 | Dillon County | 16.8 | 1.28 |
| 34 | Barnwell County | 17.0 | 1.30 |
| 35 | Laurens County | 17.0 | 1.30 |
| 36 | Georgetown County | 17.6 | 1.34 |
| 37 | Bamberg County | 18.5 | 1.41 |
| 38 | Darlington County | 20.3 | 1.56 |
| 39 | Orangeburg County | 22.8 | 1.75 |
| 40 | Sumter County | 23.6 | 1.81 |
| 41 | Williamsburg County | 24.0 | 1.83 |
| 42 | Marlboro County | 24.4 | 1.86 |
| 43 | Fairfield County | 24.7 | 1.89 |
| 44 | Chesterfield County | 26.5 | 2.03 |
| 45 | Lee County | 28.1 | 2.15 |
| 46 | Allendale County | 49.3 | 3.77 |
| 47 | South Carolina | 13.1 |