Which hospital has been operating longer, Providence Hospital or MedStar National Rehabilitation Hospital? 
Providence Hospital (Washington, D.C.): Providence Hospital is a 408 bed hospital located in the District of Columbia. Providence Hospital (Washington, D.C.):  Providence Hospital is a member of Ascension Health, the largest non-profit health care organization in the United States. MedStar National Rehabilitation Hospital: MedStar National Rehabilitation Network (MedStar NRH) is located in Washington, D.C., and specializes in treating persons with physical disabilities, including spinal cord injury, brain injury, stroke, arthritis, amputation, multiple sclerosis, post-polio syndrome, orthopedic, and other neurological conditions.
i don't know