By searching the Bio Web of the Iris Encyclopedia, the locations of hybridizers can be found. Here are the searches you need for the individual states followed by those for Canadian provinces and then countries. Note that you are searching the text of each hybridizer's entry for the term shown. So if the state name is anywhere in the entry you will find it. It may be a cultivar name, maybe the hybridizer lived there at one time, maybe it is part of another address or company name. The most common one is likely to be Virginia which appears in West Virginia.