Welcome to Mercer Residential Services!MRSI is a private, non-profit agency that has over thirty-five years of experience in the intellectual disability field. MRSI has over seventy employees in the Auglaize, Darke, Mercer and Van Wert area. We are a locally based agency with offices in Mercer and Van Wert Counties. Our business plan dictates that we will remain a regional service provider. This ensures that our agency will remain large enough to serve you ~ small enough to know you.