After finishing as runners-up in 1963–64, Lewes won the Sussex County League title the following season and moved up to Division Two of the Athenian League. They were Division Two champions in 1967–68, earning promotion to Division One. After a third-place finish in their first season in Division One, the club won the division the following season (on goal average) and were promoted to the Premier Division. In 1977 they transferred to Division Two of the Isthmian League, in which they finished as runners-up in 1979–80 to earn promotion to Division One.