Parks with paid teams include Denali National Park, Yosemite National Park, Grand Teton National Park, and Mount Rainier National Park. Many paid and volunteer professional mountain SAR teams are part of the Mountain Rescue Association (MRA) and operate under the authority of the local sheriff's department (approximately 42 of the 50 states) or state police or emergency management agency. While teams are primarily responsible to operate in one county which could be from 50 square miles to 20,000 square miles, they typically respond to adjoining counties and states.