Olathe Medical Center. Olathehealth.org DA: 20 PA: 33 MOZ Rank: 57. Today, OMC, located at Olathe Medical Park, is one of the largest hospital campuses in the Midwest with a nearly 250-acre campus in southern Johnson County; The five-story acute-care medical center is licensed for 300 beds and averages more than 44,000 patient care days per year..