Mclaren Bay Region Hospital - druglist.info. Health (Just Now) Mclaren Bay Region Hospital - supersportcars.art. Health (5 days ago) Mclaren Bay Region is a General Acute Care Hospital in Bay City Michigan. It is a teaching hospital.The current location address for Mclaren Bay Region is 1900 Columbus Ave Bay City Michigan and the contact number is 989-894-3000 and fax number is 989-891-8172..