The club developed into a strong amateur side in southwestern Germany. In post-First World War play, the club was grouped in the tier-one
Kreisliga Saar in 1919 but then moved to the
Kreisliga Pfalz in 1920. From 1930 to 1933 the team made three consecutive appearances in the final of the
Southern German championship, on the strength of four
Bezirksliga Rhein-Saar titles, and between 1934 and 1936 were three times vice-champions of the
Gauliga Südwest, one of sixteen top flight divisions formed in the re-organization of German football under the
Third Reich. World War II was hard on the club: following a 0–26 beating at the hands of
1. FC Kaiserslautern in 1942 they withdrew from competition until after the conflict. After the war the club played in the
Oberliga Südwest and captured league titles there in 1958, 1959 and 1960 while finishing as vice champions in 1954 and 1962. The club was so popular at the time that they often had to abandon their home ground in favour of the stadium in nearby
Ludwigshafen in order to accommodate crowds of up to 65,000 spectators. After the formation of the
Bundesliga, Germany's new professional league, in 1963 Pirmasens found themselves in the second division
Regionalliga Südwest where they consistently finished in the upper half of the league table over the course of the next decade. While they had several opportunities to advance to the Bundesliga through the promotion rounds they were unsuccessful. By the mid-1970s the club was faltering. They narrowly missed relegation in 1977, only staying up because rival
SV Völklingen was denied a license. However, by 1980 they found themselves in the Amateur
Oberliga Südwest (III), slipped to the
Verbandsliga Südwest by 1993, and just two seasons later were playing in the Landesliga Südwest (VI). The club has recovered nicely and climbed as high as the third division
Regionalliga Süd in 2006–07. In 2006, the club stunned German football when they defeated
Werder Bremen in the first round of the
DFB-Pokal in a penalty shootout. Since 2007 the club played in the Oberliga Südwest where the team has achieved good results, coming second in 2010 and 2011. From 2012 to 2013 the Oberliga Südwest was renamed Oberliga Rheinland-Pfalz/Saar, with FKP continuing in this league. The club won the championship in 2014 and earned promotion to the
Regionalliga Südwest. ==Reserve team==