The 2018–19 North West Counties Football League season (known as the Hallmark Security League for sponsorship reasons) was the 37th in the history of the North West Counties Football League, a football competition in England, and the first season following the split of the lower level into two geographically separated divisions. Teams were divided into three divisions: Premier Division, at Step 5, and Divisions One North and South, at Step 6. The provisional club allocations for steps 5 and 6 were announced by the FA on 25 May. The constitution was ratified by the league at its AGM on 16 June.