The Cubs have sent Triple-A players to Des Moines, Iowa to play for the Iowa Cubs since 1981. That’s the third-longest affiliation for any team at the Triple-A level. Only the Gwinnett Stripers (formerly the Richmond Braves, relocated in 2009), a Braves affiliate since 1965, and the Omaha Storm Chasers (formerly the Omaha Royals), a Royals affiliate since the Kansas City club came into existence in 1969, have had longer continuous affiliations.
Though we still don’t know exactly which affiliated minor-league teams are going away in MLB’s reorganization of the minors or how that’s going to shake out, the Cubs will apparently be continuing their relationship with Iowa:
No official announcement yet.