It took place in June and July, with 36 teams taking part: 34 county teams plus Scotland and Wales.
Middlesex Women won the Twenty20 Cup, as winners of Division 1, therefore achieving their first title.
[1] The tournament followed the 50-over 2018 Women's County Championship, and was subsequently followed by the Twenty20 2018 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.