The American Iris Society is divided into 24 Regions.  Region 21 includes Iowa, Nebraska, South Dakota, North Dakota, NWT, Nunavut, Alberta, Saskatchewan and Manitoba.  These are the nine Region 21 Affiliate Clubs listed on the AIS website (which also includes other contact information for these affiliates) and links to their websites where I could find them.

• ELKHORN VALLEY IRIS SOCIETY
• GREATER OMAHA IRIS SOCIETY
• LINCOLN IRIS SOCIETY
• MONUMENT VALLEY IRIS SOCIETY
• PLATTE VALLEY IRIS SOCIETY (Facebook)
• SIOUX EMPIRE IRIS SOCIETY
• SIOUXLAND IRIS SOCIETY
• IRISES ACROSS IOWA
• CAN-WEST IRIS SOCIETY 

If anyone knows of websites for the others, please let us know so we can update this list.