The Illinois Thunder were an

indoor soccer Indoor soccer or arena soccer (known internationally as indoor football, fast football, or showball) is five-a-side version of minifootball, derived from association football and adapted to be played in walled hardcourt indoor arena. Indoor socc ...

club (based in

Rockford, Illinois Rockford is a city in Winnebago County, Illinois, located in the far northern part of the state. Situated on the banks of the Rock River, Rockford is the county seat of Winnebago County (a small portion of the city is located in Ogle County). ...

) that competed in the National Professional Soccer League. After the 1991/92 season, the team became the

Denver Thunder Denver () is a consolidated city and county, the capital, and most populous city of the U.S. state of Colorado. Its population was 715,522 at the 2020 census, a 19.22% increase since 2010. It is the 19th-most populous city in the Unit ...

References

Year-by-year

Defunct indoor soccer clubs in the United States National Professional Soccer League (1984–2001) teams Sports clubs and teams in Rockford, Illinois Soccer clubs in Illinois 1992 disestablishments in Illinois 1990 establishments in Illinois Association football clubs established in 1990 Association football clubs disestablished in 1992 {{Illinois-footyclub-stub