| County Number | County | % of babies born to young adult mothers with very low birthweight, 1990-99 | County / State Ratio |
|---|---|---|---|
| 1 | Pickens County | 1.0 | 0.56 |
| 2 | Beaufort County | 1.2 | 0.67 |
| 3 | Oconee County | 1.2 | 0.67 |
| 4 | Berkeley County | 1.3 | 0.72 |
| 5 | Dorchester County | 1.3 | 0.72 |
| 6 | Cherokee County | 1.4 | 0.78 |
| 7 | Edgefield County | 1.4 | 0.78 |
| 8 | Aiken County | 1.5 | 0.83 |
| 9 | Greenville County | 1.5 | 0.83 |
| 10 | Horry County | 1.5 | 0.83 |
| 11 | Jasper County | 1.5 | 0.83 |
| 12 | Laurens County | 1.5 | 0.83 |
| 13 | Saluda County | 1.5 | 0.83 |
| 14 | Spartanburg County | 1.5 | 0.83 |
| 15 | Anderson County | 1.6 | 0.89 |
| 16 | Barnwell County | 1.6 | 0.89 |
| 17 | Dillon County | 1.6 | 0.89 |
| 18 | Newberry County | 1.6 | 0.89 |
| 19 | Chester County | 1.7 | 0.94 |
| 20 | Kershaw County | 1.7 | 0.94 |
| 21 | Lexington County | 1.7 | 0.94 |
| 22 | Abbeville County | 1.8 | 1.00 |
| 23 | Colleton County | 1.8 | 1.00 |
| 24 | York County | 1.8 | 1.00 |
| 25 | Georgetown County | 1.9 | 1.06 |
| 26 | Hampton County | 1.9 | 1.06 |
| 27 | Union County | 1.9 | 1.06 |
| 28 | Bamberg County | 2.0 | 1.11 |
| 29 | Charleston County | 2.0 | 1.11 |
| 30 | Greenwood County | 2.0 | 1.11 |
| 31 | Darlington County | 2.1 | 1.17 |
| 32 | Fairfield County | 2.1 | 1.17 |
| 33 | McCormick County | 2.1 | 1.17 |
| 34 | Sumter County | 2.1 | 1.17 |
| 35 | Clarendon County | 2.2 | 1.22 |
| 36 | Marion County | 2.2 | 1.22 |
| 37 | Marlboro County | 2.2 | 1.22 |
| 38 | Richland County | 2.2 | 1.22 |
| 39 | Allendale County | 2.3 | 1.28 |
| 40 | Chesterfield County | 2.3 | 1.28 |
| 41 | Orangeburg County | 2.3 | 1.28 |
| 42 | Calhoun County | 2.4 | 1.33 |
| 43 | Lancaster County | 2.4 | 1.33 |
| 44 | Florence County | 2.5 | 1.39 |
| 45 | Lee County | 2.9 | 1.61 |
| 46 | Williamsburg County | 3.0 | 1.67 |
| 47 | South Carolina | 1.8 |