https://my.mhsaa.com/Officials/Local...d-Associations
This are the two associations that cover Detroit. If you click on Wayne County under "County Listings for All Zones", you will find associations that cover the suburbs. This should give you a good place to start.
As far as IAABO, you can continue as an individual member by contacting the IAABO office. You will still be able to receive IAABO training materials and remain in good standing if you happen to move back to somewhere with an IAABO presence.