Medical Mutual of Ohio Share: Insurance Medical Mutual of Ohio Visit Website 15885 W. Sprague Road Strongsville, OH 44136 (440) 572-6375 www.medmutual.com Facebook About Map About Medical Mutual is the oldest and largest health insurer in Ohio. Our headquarters are here and we have offices throughout the state. We've been serving our members for more than 80 years. What's Nearby? Distance: 5 10 15 20 25 50 mi.