Since the league's inception in 1965, the team has always played in the top flight in Japan and is the only Japanese team to never be relegated from either the JSL1 or J1. They did finish the 1978 season in a relegation position (last of 10) but stayed up after beating Honda F.C. 1-0 on aggregate in a two-legged playoff. The last place was not automatically relegated until the 1980 season.
In 1991, it merged with the JR East's company team to become and rebranded itself as JEF United Ichihara upon the J. League's founding in 1993. The team initially built itself around the former Germany national football team player Pierre Littbarski.
From 1998 to 2000, the team struggled to stay in the J1 league and it began a series of efforts to be a competitive team. Since the hiring of Ivica Osim in 2003, JEF United has contended for the league title each year despite limited resources and struggling attendance.
On July 16, 2006, Osim left the team to take over the coach of the Japan national team and was succeeded by Amar Osim, his son and assistant coach. On December 5, 2007, it was announced that Osim had been sacked after the club's lowly 13th place finish in the 2007 season.
After 13 games in the 2008 season Josip Kuže was sacked as team manager. On 8th May 2008 it was announced that the new manager was Alex Miller. Miller was First Team Coach at Liverpool FC alongside Rafa Benitez prior to joining JEF United.
Furukawa Electric is no longer the main sponsor of the club, a job these days taken over by Fuji Electric.
|1993||J1 1st stage||5 / 10||18||-||9||-||9||20,273|
|J1 2nd stage||9 / 10||18||-||5||-||13|
|J1 Total||8 / 10||36||-||14||-||22|
|1994||J1 1st stage||6 / 12||22||-||10||-||12||22,262|
|J1 2nd stage||9 / 12||22||-||9||-||13|
|J1 Total||9 / 12||44||-||19||-||25|
|1995||J1 1st stage||6 / 14||26||45||14||-||12||15,418|
|J1 2nd stage||7 / 14||26||43||14||-||12|
|J1 Total||5 / 14||52||88||28||-||24|
|1996||J1||9 / 16||30||40||13||-||17||12,008|
|1997||J1 1st stage||15 / 17||16||13||5||-||11||5,693|
|J1 2nd stage||14 / 17||16||15||6||-||10|
|J1 Total||13 / 17||32||28||11||-||21|
|1998||J1 1st stage||11 / 18||17||21||7||-||10||5,365|
|J1 2nd stage||18 / 18||17||4||2||-||15|
|J1 Total||16 / 18||34||25||9||-||25|
|1999||J1 1st stage||15 / 16||15||12||4||2||9||5,774|
|J1 2nd stage||11 / 16||15||16||6||0||9|
|J1 Total||13 / 16||30||28||10||2||18|
|2000||J1 1st stage||11 / 16||15||19||6||1||8||6,338|
|J1 2nd stage||16 / 16||15||9||3||1||11|
|J1 Total||14 / 16||30||28||9||2||19|
|2001||J1 1st stage||Runners-up / 16||15||27||10||0||5||7,818|
|J1 2nd stage||5 / 16||15||23||7||2||6|
|J1 Total||3 / 16||30||50||17||2||11|
|2002||J1 1st stage||8 / 16||15||23||7||3||5||7,897|
|J1 2nd stage||11 / 16||15||18||6||0||9|
|J1 Total||7 / 16||30||41||13||3||14|
|2003||J1 1st stage||3 / 16||15||27||8||3||4||9,709|
|J1 2nd stage||Runners-up / 16||15||26||7||5||3|
|J1 Total||3 / 16||30||53||15||8||7|
|2004||J1 1st stage||7 / 16||15||22||5||7||3||10,012|
|J1 2nd stage||Runners-up / 16||15||28||8||4||3|
|J1 Total||4 / 16||30||50||13||11||6|
|2005||J1||4 / 18||34||59||16||11||7||9,535|
|2006||J1||11 / 18||34||44||13||5||16||13,393|
|2007||J1||13 / 18||34||42||12||6||16||14,149|
|2008||J1||12 / 18||1||1||0||1||0|
|2006||A3 Champions Cup||3rd||-|
| |- |