[1] These, combined with the folding of Macclesfield Town in 2020–21 and the knock-on effects of Bury's collapse in 2019–20, meant that for the 2021–22 season the three divisions had the irregular complement of 23, 22 and 21 teams, respectively.
In 2019, prior to these COVID-19 related impacts, the league had intended the 2021–22 season to be the first using a new structure in which the number of teams in its North and South divisions would increase, resulting in three 24-team divisions.
Grimsby Town became the first former top-flight First Division club to be relegated to the National League twice, and their matches against Notts County make them the second pairing of clubs to face each other across all top five tiers of English football (after the Luton Town vs Oxford United fixture).
The National League North consisted of 22 teams for the final time.
The National League South consisted of 21 teams after the 2019–20 season and did so for the final time.