The amalgamation continued until 1984 when New Plymouth Old Boys replaced Taranaki United for the 1985 Central League.

New Plymouth United won the 1992 Central League Division Three after its first season in the competition before amalgamating with Old Boys at the end of that year and competing in the 1993 Central League Division Two as New Plymouth Rangers.

[6] In 2017 New Plymouth Rangers entered the Central Federation League for the first time.

The club won the 2020 Central Federation League before being relegated at the end of the 2021 season to the Taranaki Premiership.

These feats have not yet been equalled by the club under its new name, though Rangers did reach the Fifth Round (last 16 stage) in the 1995 competition.