| County Number | SC Counties | Cases of chlamydia among 25 - 29 year olds from 1990-99 divided by population | County / State Ratio |
|---|---|---|---|
| 1 | Pickens County | 1.2 | 0.32 |
| 2 | Berkeley County | 1.6 | 0.41 |
| 3 | Edgefield County | 1.6 | 0.41 |
| 4 | Lexington County | 1.7 | 0.44 |
| 5 | Oconee County | 1.7 | 0.44 |
| 6 | Aiken County | 1.9 | 0.49 |
| 7 | Greenville County | 1.9 | 0.50 |
| 8 | Cherokee County | 2.3 | 0.60 |
| 9 | Dorchester County | 2.3 | 0.61 |
| 10 | York County | 2.4 | 0.64 |
| 11 | Hampton County | 2.6 | 0.68 |
| 12 | Beaufort County | 2.6 | 0.69 |
| 13 | Lancaster County | 2.8 | 0.74 |
| 14 | Union County | 2.9 | 0.76 |
| 15 | Abbeville County | 3.2 | 0.85 |
| 16 | Horry County | 3.3 | 0.85 |
| 17 | Kershaw County | 3.3 | 0.88 |
| 18 | Marion County | 3.4 | 0.88 |
| 19 | Spartanburg County | 3.5 | 0.92 |
| 20 | Calhoun County | 3.5 | 0.93 |
| 21 | Anderson County | 3.6 | 0.94 |
| 22 | Greenwood County | 3.7 | 0.97 |
| 23 | Jasper County | 3.9 | 1.01 |
| 24 | Colleton County | 3.9 | 1.03 |
| 25 | Barnwell County | 4.0 | 1.05 |
| 26 | Florence County | 4.0 | 1.05 |
| 27 | Dillon County | 4.0 | 1.06 |
| 28 | Chester County | 4.2 | 1.10 |
| 29 | Laurens County | 4.2 | 1.11 |
| 30 | Saluda County | 4.3 | 1.13 |
| 31 | Charleston County | 4.5 | 1.19 |
| 32 | Newberry County | 4.8 | 1.25 |
| 33 | McCormick County | 5.6 | 1.46 |
| 34 | Clarendon County | 5.8 | 1.51 |
| 35 | Richland County | 5.8 | 1.51 |
| 36 | Darlington County | 6.1 | 1.61 |
| 37 | Marlboro County | 6.8 | 1.78 |
| 38 | Georgetown County | 6.9 | 1.80 |
| 39 | Chesterfield County | 7.0 | 1.83 |
| 40 | Fairfield County | 7.0 | 1.85 |
| 41 | Lee County | 7.1 | 1.85 |
| 42 | Sumter County | 7.6 | 2.00 |
| 43 | Bamberg County | 7.9 | 2.08 |
| 44 | Orangeburg County | 8.2 | 2.14 |
| 45 | Williamsburg County | 8.6 | 2.27 |
| 46 | Allendale County | 12.8 | 3.35 |
| 47 | South Carolina | 3.8 |