2015 Main
Group A
| Pts | W | L | D | N/R | Pts | |||
| 1 | Surrey | 8 | 6 | 1 | 0 | 1 | 2091:1697 | 13 |
| 2 | Gloucestershire | 8 | 5 | 2 | 0 | 1 | 1815:1818 | 11 |
| 3 | Yorkshire | 8 | 4 | 2 | 0 | 2 | 1425:1314 | 10 |
| 4 | Durham | 8 | 4 | 3 | 0 | 1 | 1900:1671 | 9 |
| 5 | Northamptonshire | 8 | 4 | 3 | 0 | 1 | 1449:1644 | 9 |
| 6 | Somerset | 8 | 4 | 4 | 0 | 0 | 1770:1772 | 8 |
| 7 | Derbyshire | 8 | 4 | 4 | 0 | 0 | 1663:1659 | 8 |
| 8 | Worcestershire | 8 | 1 | 6 | 0 | 1 | 1479:1775 | 3 |
| 9 | Leicestershire | 8 | 0 | 7 | 0 | 1 | 1400:1642 | 1 |
Group B
| Pts | W | L | D | N/R | Pts | |||
| 1 | Nottinghamshire | 8 | 5 | 1 | 0 | 2 | 1624:1572 | 12 |
| 2 | Essex | 8 | 4 | 2 | 0 | 2 | 1400:1393 | 10 |
| 3 | Hampshire | 8 | 3 | 3 | 0 | 2 | 1458:1304 | 9 |
| 4 | Kent | 8 | 3 | 3 | 0 | 2 | 1428:1561 | 8 |
| 5 | Lancashire | 8 | 3 | 3 | 0 | 2 | 1363:1288 | 8 |
| 6 | Warwickshire / Birmingham Bears | 8 | 3 | 3 | 0 | 2 | 1241:1482 | 8 |
| 7 | Middlesex | 8 | 3 | 4 | 0 | 1 | 1702:1604 | 7 |
| 8 | Glamorgan | 8 | 2 | 2 | 0 | 4 | 1039:897 | 3 |
| 9 | Sussex | 8 | 0 | 5 | 0 | 3 | 1214:1368 | 3 |
Promotion ~ One~Day Cup (Play Offs)
2015 Play Offs
Quarter-finals
| 1 | Essex (2) | Yorkshire (3) | 232 : 252 |
| 2 | Gloucestershire (2) | Hampshire (3) | 218 : 217 |
| 3 | Surrey (1) | Kent (4) | 273 : 233 |
| 4 | Nottinghamshire (1) | Durham (4) | 170 : 144 |
Semi-finals
| 1 | Yorkshire (3) | Gloucestershire (2) | 263 : 267 |
| 2 | Surrey (1) | Nottinghamshire (1) | 300 : 296 |
Final
| 1 | Gloucestershire (2) | Surrey (1) | 220 : 214 |
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