Formed in 1905, The Isthmian League soon became the primary amateur league
in the South of England.
Starting, as many early leagues did, in a small manner with six clubs, the
league had to survive a crisis after only two seasons, when three of the six
all left to join the Amateur Football Assocation. Luckily, replacements
were found, and a year later, the league expanded to 10 teams.
Since then, the league has usually had many more clubs wanting to join than
it has vacancies. For a long period, membership was by invitiation only,
many ambitious clubs being unable to convince existing members that they
deserved a place at the expense of an existing club. The closed shop situation
was not really broken until the 1950s when Barking and Bromley joined. A few
new clubs followed, including no less than 4 in 1963, mainly from the
Athenian League.
In 1973 the league took a step many had been clamouring for for decades - a
second division was formed, again absorbing mainly Athenian League clubs.
Since then, further expansion and eventual assimilation into the national
pyramid system has seen the structure of the league form into a very strong
league of several divisions, the top division being a direct feeder to the
Football Conference.
The amateur status of the league, maintained until the distinction between
professional and amateur players was abolished in 1974, meant that the member
clubs all had the F.A. Amateur Cup to compete for, and very successful they
were too. On no less than 30 occasions did an Isthmian club pick up the Cup,
Clapton leading the way with 5, closely followed by Dulwich Hamlet with 4.
After a swathe of re-organisations of non-league football, the clubs of the Isthmian
League were split between the F.A. Trophy and the F.A. Vase. Dagenham in 1979-80,
followed by Bishop's Stortford the year after were the first Isthmian clubs
to take the Trophy at Wembley. Yeading are the only Isthmian club to lift the
Vase, while Southall, Oxford City and Berkhamsted Town have all been losing finalists.
Since 2006, all Isthmian clubs play in the Trophy.
Although it's geographic coverage has shifted somewhat due to the
re-organisation of the non-league pyramid, the league is currently the highest regional
league for a large swathe of the
South East of England, covering clubs from the South Midlands to the South Coast, and
from the New Forest eastwards to the North Sea.
Currently (as of 2023-24) the league consists of 4 divisions of up to 24 clubs each, a Premier Division and
three Division Ones split North, South Central and South East.
There is an excellent archive with huge amounts of detail about the Isthmian League from 1988 to date available at : www.isthmianarchive.co.uk