The Chamber of St Matthews Johnson-Witkemper Share: Insurance Johnson-Witkemper Visit Website 305 Washington St. Columbus, IN 47201 (812) 372-7829 (800) 552-0116 (812) 348-7657 (fax) About Map About Market group health and employee benefits - fully insured and self-funded. What's Nearby? Distance: 5 10 15 20 25 50 mi.