FREE Hearing Test and a Risk-FREE Trial on Hearing Devices at Our St. Charles Missouri Southwestern Hearing Aid Center.The Southwestern Hearing Center in St. Charles is located at the corner of Portwest and Highway 94.There are lots of hearing aid companies -so choosing the right one can feel overwhelming sometimes. But don’t worry. We’re here to make your decision easier. Our state-of-the-art hearing aid center and dedicated staff are here to make sure you get the hearing aids you need. Call us today for a free hearing and hearing aids consultation.