The 2019–20 season was the 77th season in the history of Eastern Counties Football League, a football competition in England.
[1] As a result of the COVID-19 pandemic, this season's competition was formally abandoned on 26 March 2020, with all results from the season being expunged, and no promotion or relegation taking place to, from, or within the competition.
[2] On 30 March 2020, sixty-six non-league clubs sent an open letter to the Football Association requesting that they reconsider their decision.
[3] A legal appeal against the decision, funded by the Northern Premier League's South Shields, was dismissed later in June.
Division One South featured 17 clubs which competed in the division last season, along with three new clubs, relegated from the Essex Senior League: