The inaugural First Division featured ten teams.
In 1985 five teams – Bray Wanderers, Cobh Ramblers, Derry City, E.M.F.A.
and Newcastle United – were elected to join the League of Ireland.
All five subsequently participated in the inaugural 1985–86 First Division season, along with Monaghan United from the League of Ireland B Division and four clubs – Drogheda United, Finn Harps, Longford Town and Sligo Rovers – who were relegated following the 1984–85 League of Ireland season.
Bray Wanderers were the inaugural First Division champions.