Without having any more specific information (which you need not share) Duluth is a fairly large city for Minnesota, unless you have a specific specialist need or some insurance need, you should be able to find the care you need for most common needs and have a good number of providers to find a professional that meets your care needs. At a worst case scenario, both the twin cities and Rochester (Mayo Clinic) are about 3 hours away, and that should exhaust even the most rare specialists.