ClubLocationLeagueTierFounded
Ards—NIFL Championship—1900Ballymena United—NIFL Premiership—1934Bangor—NIFL Premier Intermediate League—1918Belfast Celtic—Dissolved 1949—1891Carrick Rangers—NIFL Premiership—1939Cliftonville—NIFL Premiership—1879Coleraine—NIFL Premiership—1927Crusaders—NIFL Premiership—1898Derry City—League of Ireland Premier Division (IRL)—1928Dundela—NIFL Championship—1895Glenavon—NIFL Premiership—1889Glentoran—NIFL Premiership—1882Linfield—NIFL Premiership—1886Lisburn Distillery—NIFL Premier Intermediate League—1880Portadown—NIFL Premiership—1887Ulster—Dissolved 193?—1877