It took place in June and July, with 36 teams taking part: 34 county teams plus Scotland and Wales.
Lancashire Women won the Twenty20 Cup, as winners of Division 1, the first of two trophies they won in 2017, along with the County Championship.
[1] The tournament ran alongside the 50-over 2017 Women's County Championship, and was followed by the Twenty20 2017 Women's Cricket Super League, competed for by regional teams.
Teams played matches within a series of divisions with the winners of the top division being crowned the Champions.
The championship works on a points system with positions within the divisions being based on the total points.