| Rank* | County | % of 3rd Graders Below Basic on 2005 PACT (Math) | Rank* | County | % of 5th Graders Below Basic on 2005 PACT (Math) | Rank* | County | % of 8th Graders Below Basic on 2005 PACT (Math) |
|---|---|---|---|---|---|---|---|---|
| 1 | Williamsburg | 9.1 | 1 | Georgetown | 11.3 | 1 | Oconee | 16.4 |
| 2 | Horry | 9.7 | 2 | Horry | 11.5 | 2 | Anderson | 22.4 |
| 3 | Dorchester | 10.5 | 3 | Anderson | 13.7 | 3 | Horry | 24.1 |
| 4 | Pickens | 10.5 | 4 | Oconee | 15.5 | 4 | Lexington | 24.6 |
| 5 | Anderson | 10.6 | 5 | Lexington | 15.7 | 5 | Greenwood | 24.9 |
| 6 | Georgetown | 11.3 | 6 | Sumter | 17.0 | 6 | Edgefield | 25.0 |
| 7 | Abbeville | 11.6 | 7 | York | 17.2 | 7 | Aiken | 25.4 |
| 8 | York | 11.9 | 8 | Dorchester | 17.5 | 8 | Kershaw | 25.9 |
| 9 | Charleston | 12.3 | 9 | Pickens | 17.9 | 9 | Spartanburg | 26.1 |
| 10 | Greenville | 12.7 | 10 | Greenwood | 18.3 | 10 | Saluda | 26.5 |
| 11 | Kershaw | 13.0 | 11 | Laurens | 18.3 | 11 | Dorchester | 27.4 |
| 12 | Lexington | 13.1 | 12 | Aiken | 18.7 | 12 | York | 28.0 |
| 13 | McCormick | 14.1 | 13 | Williamsburg | 19.5 | 13 | Pickens | 30.3 |
| 14 | Aiken | 15.3 | 14 | Kershaw | 20.4 | 14 | Abbeville | 30.7 |
| 15 | Oconee | 15.7 | 15 | Spartanburg | 21.5 | 15 | Williamsburg | 32.1 |
| 16 | Berkeley | 15.9 | 16 | Charleston | 22.1 | 16 | Berkeley | 34.1 |
| 17 | Calhoun | 16.9 | 17 | Lancaster | 22.2 | 17 | Charleston | 34.5 |
| 18 | Laurens | 17.4 | 18 | Edgefield | 22.3 | 18 | Chesterfield | 34.6 |
| 19 | Spartanburg | 17.5 | 19 | Calhoun | 22.4 | 19 | Laurens | 34.9 |
| 20 | Clarendon | 18.1 | 20 | Newberry | 22.6 | 20 | Union | 35.3 |
| 21 | Greenwood | 18.2 | 21 | Greenville | 23.2 | 21 | Greenville | 35.5 |
| 22 | Sumter | 18.4 | 22 | Chesterfield | 24.1 | 22 | Chester | 38.3 |
| 23 | Darlington | 18.7 | 23 | Union | 25.1 | 23 | Barnwell | 38.4 |
| 24 | Saluda | 19.2 | 24 | Saluda | 25.3 | 24 | Lancaster | 38.4 |
| 25 | Dillon | 19.4 | 25 | Abbeville | 25.5 | 25 | McCormick | 38.7 |
| 26 | Florence | 20.3 | 26 | Berkeley | 26.2 | 26 | Richland | 38.7 |
| 27 | Beaufort | 21.1 | 27 | Richland | 26.2 | 27 | Cherokee | 39.8 |
| 28 | Lancaster | 21.2 | 28 | Cherokee | 27.8 | 28 | Georgetown | 40.2 |
| 29 | Edgefield | 21.5 | 29 | McCormick | 29.2 | 29 | Beaufort | 40.3 |
| 30 | Richland | 22.2 | 30 | Florence | 29.8 | 30 | Sumter | 40.4 |
| 31 | Barnwell | 22.9 | 31 | Beaufort | 30.5 | 31 | Newberry | 40.5 |
| 32 | Chester | 22.9 | 32 | Allendale | 31.3 | 32 | Calhoun | 40.8 |
| 33 | Newberry | 23.5 | 33 | Clarendon | 31.4 | 33 | Darlington | 41.2 |
| 34 | Union | 23.7 | 34 | Darlington | 32.4 | 34 | Clarendon | 42.4 |
| 35 | Cherokee | 24.1 | 35 | Dillon | 32.7 | 35 | Florence | 43.1 |
| 36 | Chesterfield | 24.3 | 36 | Chester | 34.5 | 36 | Dillon | 43.8 |
| 37 | Colleton | 25.3 | 37 | Barnwell | 36.0 | 37 | Marion | 47.9 |
| 38 | Hampton | 26.9 | 38 | Bamberg | 37.5 | 38 | Marlboro | 49.2 |
| 39 | Orangeburg | 27.0 | 39 | Colleton | 38.3 | 39 | Orangeburg | 51.6 |
| 40 | Bamberg | 31.5 | 40 | Orangeburg | 39.4 | 40 | Lee | 51.7 |
| 41 | Fairfield | 32.6 | 41 | Hampton | 40.3 | 41 | Colleton | 54.6 |
| 42 | Jasper | 32.7 | 42 | Fairfield | 43.6 | 42 | Bamberg | 55.3 |
| 43 | Lee | 35.0 | 43 | Marion | 44.8 | 43 | Allendale | 55.9 |
| 44 | Marlboro | 35.0 | 44 | Lee | 51.3 | 44 | Hampton | 58.4 |
| 45 | Allendale | 40.0 | 45 | Marlboro | 51.3 | 45 | Jasper | 59.4 |
| 46 | Marion | 41.6 | 46 | Jasper | 53.2 | 46 | Fairfield | 63.1 |
| - | South Carolina | 16.6 | - | South Carolina | 22.8 | - | South Carolina | 33.7 |
* 1 is best, 46 is worst.