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North
South
Promotion ~ NatWest T20 Blast (Play Offs)
Quarter-finals
Semi-finals
Final
2017 Main
North
| Pts | W | L | D | N/R | Pts | |||
| 1 | Nottinghamshire | 14 | 8 | 4 | 0 | 2 | 2067:2238 | 18 |
| 2 | Derbyshire | 14 | 8 | 5 | 0 | 1 | 2217:2157 | 17 |
| 3 | Warwickshire / Birmingham Bears | 14 | 8 | 5 | 0 | 1 | 2170:2155 | 17 |
| 4 | Leicestershire | 14 | 8 | 5 | 0 | 1 | 1965:1965 | 17 |
| 5 | Yorkshire | 14 | 6 | 5 | 1 | 2 | 2200:2042 | 15 |
| 6 | Northamptonshire | 14 | 6 | 5 | 0 | 3 | 1825:1757 | 15 |
| 7 | Lancashire | 14 | 5 | 6 | 1 | 2 | 1994:1869 | 13 |
| 8 | Worcestershire | 14 | 3 | 10 | 0 | 1 | 2124:2244 | 7 |
| 9 | Durham | 14 | 3 | 10 | 0 | 1 | 1914:2049 | 3 |
South
| Pts | W | L | D | N/R | Pts | |||
| 1 | Glamorgan | 14 | 7 | 3 | 0 | 4 | 1556:1616 | 18 |
| 2 | Surrey | 14 | 7 | 5 | 0 | 2 | 1999:1951 | 16 |
| 3 | Hampshire | 14 | 7 | 6 | 0 | 1 | 1945:2046 | 15 |
| 4 | Somerset | 14 | 6 | 6 | 0 | 2 | 2025:1875 | 14 |
| 5 | Sussex | 14 | 5 | 5 | 1 | 3 | 1583:1696 | 14 |
| 6 | Kent | 14 | 6 | 7 | 1 | 0 | 2357:2332 | 13 |
| 7 | Middlesex | 14 | 5 | 7 | 1 | 1 | 2080:2006 | 12 |
| 8 | Essex | 14 | 5 | 7 | 0 | 2 | 1931:2051 | 12 |
| 9 | Gloucestershire | 14 | 4 | 6 | 1 | 3 | 1592:1495 | 12 |
Promotion ~ NatWest T20 Blast (Play Offs)
2017 Play Offs
Quarter-finals
| 1 | Surrey | Warwickshire / Birmingham Bears | 204 : 207 |
| 2 | Glamorgan | Leicestershire | 126 : 123 |
| 3 | Derbyshire | Hampshire | 148 : 249 |
| 4 | Nottinghamshire | Somerset | 152 : 151 |
Semi-finals
| 1 | Warwickshire / Birmingham Bears | Glamorgan | 175 : 164 |
| 2 | Hampshire | Nottinghamshire | 146 : 169 |
Final
| 1 | Warwickshire / Birmingham Bears | Nottinghamshire | 168 : 190 |
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