The Illinois Thunder were an indoor soccer club (based in Rockford, Illinois) that competed in the National Professional Soccer League.

After the 1991/92 season, the team became the Denver Thunder.

References

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Year-by-year

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Year Division League Reg. season Playoffs Avg. attendance
1990–91 2 NPSL 4th, National Did not qualify 1,613
1991–92 2 NPSL 3rd, National Quarterfinals 2,160