In 1935 the club became founder members of the Eastern Counties League, where they were champions in the 1936-37 season. After this they joined the Essex County League, where they were runners-up in their first season, but then rejoined the Eastern Counties League. After World War II the club appears to have been inactive until 1952 when they rejoined the Eastern Counties League. In 1955 they left this league and it is unclear where they played for the next decade.
In 1964 Crittall joined the Greater London League, before moving to the Metropolitan League in 1966. In 1970 they rejoined the Eastern Counties League, where they were to play for the next twenty years.. Their most successful decade was the 1980s, when they were league champions twice (1983-84 and 1984-85) and runners-up on four other occasions. After the last of these second-place finished in 1990-91 they stepped up to the Southern League Southern Division. In 1996 they switched to the Isthmian League Division Three, but three promotions in five years brought them to the Premier Division by 2002. in 2005-06 they were Isthmian League champions and gained promotion to the Conference South. In the 2006–07 season they lost 1-0 to Salisbury City in the Conference South play-off final, and reached the play-offs again at the end of the 2007-08 season.
Team's bid to get stadium ready delayed by intruders ; Braintree Town FC will be relegated if ground is not up to scratch [Edition 3]
Jan 19, 2012; BRAINTREE Town FC could still be relegated from the Blue Square Premier division - regardless of where they finish in the league...
Council throws a Pounds 150k lifeline to keep The Iron up ; Club has until March to improve its stadium [Edition 3]
Nov 10, 2011; TAXPAYERS have saved Braintree Town from the heartbreak of automatic relegation. The Iron has until March 31 to bring its ground...